SAMA5 NAND: Only CS3 can have NAND
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Gregory Nutt
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@ -3038,44 +3038,46 @@ config SAMA5_EBICS0_LCD
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config SAMA5_EBICS0_NOR
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bool "NOR Flash"
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config SAMA5_EBICS0_NAND
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bool "NAND Flash"
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select MTD
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select MTD_NAND
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select SAMA5_HAVE_NAND
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# CS0 cannot support NAND
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# config SAMA5_EBICS0_NAND
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# bool "NAND Flash"
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# select MTD
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# select MTD_NAND
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# select SAMA5_HAVE_NAND
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endchoice # CS0 Memory Type
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choice
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prompt "NAND ECC type"
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default SAMA5_EBICS0_ECCNONE
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depends on SAMA5_EBICS0_NAND
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config SAMA5_EBICS0_ECCNONE
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bool "No ECC"
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---help---
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Only raw transfers to/from NAND are supported
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config SAMA5_EBICS0_SWECC
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bool "Software ECC"
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depends on MTD_NAND_SWECC
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---help---
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ECC is performed by higher level software logic
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config SAMA5_EBICS0_PMECC
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bool "NAND H/W PMECC Support"
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depends on MTD_NAND_HWECC
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select SAMA5_HAVE_PMECC
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---help---
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Enable hardware assisted support for ECC calculations
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config SAMA5_EBICS0_CHIPECC
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bool "Embedded chip ECC"
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depends on MTD_NAND_EMBEDDEDECC
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---help---
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Some NAND devices have internal, embedded ECC function.
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endchoice # NAND ECC type
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# CS0 cannot support NAND
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# choice
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# prompt "NAND ECC type"
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# default SAMA5_EBICS0_ECCNONE
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# depends on SAMA5_EBICS0_NAND
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#
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# config SAMA5_EBICS0_ECCNONE
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# bool "No ECC"
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# ---help---
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# Only raw transfers to/from NAND are supported
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#
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# config SAMA5_EBICS0_SWECC
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# bool "Software ECC"
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# depends on MTD_NAND_SWECC
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# ---help---
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# ECC is performed by higher level software logic
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#
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# config SAMA5_EBICS0_PMECC
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# bool "NAND H/W PMECC Support"
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# depends on MTD_NAND_HWECC
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# select SAMA5_HAVE_PMECC
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# ---help---
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# Enable hardware assisted support for ECC calculations
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#
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# config SAMA5_EBICS0_CHIPECC
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# bool "Embedded chip ECC"
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# depends on MTD_NAND_EMBEDDEDECC
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# ---help---
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# Some NAND devices have internal, embedded ECC function.
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#
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# endchoice # NAND ECC type
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endif # SAMA5_EBICS0
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config SAMA5_EBICS1
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@ -3121,44 +3123,46 @@ config SAMA5_EBICS1_LCD
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config SAMA5_EBICS1_NOR
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bool "NOR Flash"
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config SAMA5_EBICS1_NAND
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bool "NAND Flash"
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select MTD
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select MTD_NAND
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select SAMA5_HAVE_NAND
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# CS1 cannot support NAND
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# config SAMA5_EBICS1_NAND
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# bool "NAND Flash"
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# select MTD
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# select MTD_NAND
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# select SAMA5_HAVE_NAND
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endchoice # CS1 Memory Type
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choice
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prompt "NAND ECC type"
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default SAMA5_EBICS1_ECCNONE
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depends on SAMA5_EBICS1_NAND
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config SAMA5_EBICS1_ECCNONE
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bool "No ECC"
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---help---
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Only raw transfers to/from NAND are supported
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config SAMA5_EBICS1_SWECC
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bool "Software ECC"
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depends on MTD_NAND_SWECC
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---help---
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ECC is performed by higher level software logic
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config SAMA5_EBICS1_PMECC
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bool "NAND H/W PMECC Support"
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depends on MTD_NAND_HWECC
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select SAMA5_HAVE_PMECC
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---help---
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Enable hardware assisted support for ECC calculations
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config SAMA5_EBICS1_CHIPECC
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bool "Embedded chip ECC"
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depends on MTD_NAND_EMBEDDEDECC
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---help---
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Some NAND devices have internal, embedded ECC function.
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endchoice # NAND ECC type
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# CS1 cannot support NAND
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# choice
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# prompt "NAND ECC type"
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# default SAMA5_EBICS1_ECCNONE
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# depends on SAMA5_EBICS1_NAND
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#
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# config SAMA5_EBICS1_ECCNONE
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# bool "No ECC"
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# ---help---
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# Only raw transfers to/from NAND are supported
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#
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# config SAMA5_EBICS1_SWECC
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# bool "Software ECC"
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# depends on MTD_NAND_SWECC
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# ---help---
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# ECC is performed by higher level software logic
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#
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# config SAMA5_EBICS1_PMECC
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# bool "NAND H/W PMECC Support"
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# depends on MTD_NAND_HWECC
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# select SAMA5_HAVE_PMECC
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# ---help---
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# Enable hardware assisted support for ECC calculations
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#
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# config SAMA5_EBICS1_CHIPECC
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# bool "Embedded chip ECC"
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# depends on MTD_NAND_EMBEDDEDECC
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# ---help---
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# Some NAND devices have internal, embedded ECC function.
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#
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# endchoice # NAND ECC type
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endif # SAMA5_EBICS1
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config SAMA5_EBICS2
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@ -3204,44 +3208,46 @@ config SAMA5_EBICS2_LCD
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config SAMA5_EBICS2_NOR
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bool "NOR Flash"
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config SAMA5_EBICS2_NAND
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bool "NAND Flash"
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select MTD
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select MTD_NAND
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select SAMA5_HAVE_NAND
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# CS2 cannot support NAND
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# config SAMA5_EBICS2_NAND
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# bool "NAND Flash"
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# select MTD
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# select MTD_NAND
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# select SAMA5_HAVE_NAND
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endchoice # CS2 Memory Type
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choice
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prompt "NAND ECC type"
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default SAMA5_EBICS2_ECCNONE
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depends on SAMA5_EBICS2_NAND
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config SAMA5_EBICS2_ECCNONE
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bool "No ECC"
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---help---
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Only raw transfers to/from NAND are supported
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config SAMA5_EBICS2_SWECC
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bool "Software ECC"
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depends on MTD_NAND_SWECC
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---help---
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ECC is performed by higher level software logic
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config SAMA5_EBICS2_PMECC
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bool "NAND H/W PMECC Support"
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depends on MTD_NAND_HWECC
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select SAMA5_HAVE_PMECC
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---help---
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Enable hardware assisted support for ECC calculations
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config SAMA5_EBICS2_CHIPECC
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bool "Embedded chip ECC"
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depends on MTD_NAND_EMBEDDEDECC
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---help---
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Some NAND devices have internal, embedded ECC function.
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endchoice # NAND ECC type
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# CS2 cannot support NAND
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# choice
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# prompt "NAND ECC type"
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# default SAMA5_EBICS2_ECCNONE
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# depends on SAMA5_EBICS2_NAND
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#
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# config SAMA5_EBICS2_ECCNONE
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# bool "No ECC"
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# ---help---
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# Only raw transfers to/from NAND are supported
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#
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# config SAMA5_EBICS2_SWECC
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# bool "Software ECC"
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# depends on MTD_NAND_SWECC
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# ---help---
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# ECC is performed by higher level software logic
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#
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# config SAMA5_EBICS2_PMECC
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# bool "NAND H/W PMECC Support"
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# depends on MTD_NAND_HWECC
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# select SAMA5_HAVE_PMECC
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# ---help---
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# Enable hardware assisted support for ECC calculations
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#
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# config SAMA5_EBICS2_CHIPECC
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# bool "Embedded chip ECC"
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# depends on MTD_NAND_EMBEDDEDECC
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# ---help---
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# Some NAND devices have internal, embedded ECC function.
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#
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# endchoice # NAND ECC type
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endif # SAMA5_EBICS2
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config SAMA5_EBICS3
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@ -85,6 +85,11 @@
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#define NANDECC_PMECC (NANDECC_HWECC + 1)
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/* Per NAND bank ECC selections */
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/* Only CS3 can support NAND. The rest is a fantasy */
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# undef CONFIG_SAMA5_EBICS0_NAND
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# undef CONFIG_SAMA5_EBICS1_NAND
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# undef CONFIG_SAMA5_EBICS2_NAND
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#if defined(CONFIG_SAMA5_EBICS0_NAND)
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# if defined(CONFIG_SAMA5_EBICS0_ECCNONE)
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@ -1352,6 +1352,9 @@ SDRAM Support
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NAND Support
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============
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NAND Support
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------------
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NAND Support can be added to the NSH configuration by modifying the
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NuttX configuration file as follows:
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@ -1393,19 +1396,25 @@ NAND Support
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Other file systems are not recommended because only NXFFS can handle
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bad blocks and only NXFFS performs wear-leveling.
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NOTE: NXFFS is very slow. The first time that you start the system,
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be prepared for a long wait; NXFFS will need to format the NAND
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NOTE: NXFFS can be very slow. The first time that you start the
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system, be prepared for a wait; NXFFS will need to format the NAND
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volume. I have lots of debug on so I don't yet know what the
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optimized wait would be. But with debug ON, software ECC, and no
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DMA the wait is in many tens of minutes, even hours if many debug
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options are enabled.
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optimized wait will be. But with debug ON, software ECC, and no
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DMA the wait is in many tens of minutes (and substantially longer
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if many debug options are enabled.
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[I don't yet have data for the more optimal cases. It will be
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significantly less, but still not fast.]
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On subsequent boots, after the NXFFS file system has been created the
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delay will be less. But the NAND-related boot time can still be
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substantial. This is because NXFFS needs to scan the NAND device
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and build the in-memory dataset needed to access NAND. It is
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recommended you create a separated thread at boot time to bring up
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NXFFS so that you don't delay the boot-to-prompt time excessively.
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delay will be less. When the new file system is empty, it will be
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very fast. But the NAND-related boot time can become substantial when
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there has been a lot of usage of the NAND. This is because NXFFS
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needs to scan the NAND device and build the in-memory dataset needed
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to access NAND and there is more that must be scanned after the device
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has been used. You may want tocreate a separate thread at boot time
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to bring up NXFFS so that you don't delay the boot-to-prompt time
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excessively in these longer delay cases.
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NOTE: There is another NXFFS related issue: When the FLASH is
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fully used, NXFFS will restructure the entire FLASH, the delay to
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@ -1433,6 +1442,38 @@ NAND Support
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Application Configuration -> NSH Library
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CONFIG_NSH_ARCHINIT=y : Use architecture-specific initialization
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Using NAND
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----------
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With the options CONFIG_SAMA5_NAND_AUTOMOUNT=y and
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CONFIG_SAMA5_NAND_NXFFS=y, the NAND FLASH will be mounted in the NSH
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start-up logic before the NSH prompt appears. There is no feedback as
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to whether or not the mount was successful. You can, however, see the
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mounted file systems using the nsh 'mount' command:
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nsh> mount
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/mnt/nand type nxffs
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Then NAND can be used like any other file system:
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nsh> echo "This is a test" >/mnt/nand/atest.txt
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nsh> ls -l /mnt/nand
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/mnt/nand:
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---x--x--x 16 atest.txt
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nsh> cat /mnt/nand/atest.txt
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This is a test
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The NAND volume can be un-mounted with this comment:
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nsh> umount /mnt/nand
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nsh> mount
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And re-mounted with this command:
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nsh> mount -t nxffs /mnt/mystuff
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nsh> mount
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/mnt/mystuff type nxffs
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AT24 Serial EEPROM
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==================
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@ -156,8 +156,8 @@ struct nxffs_volume_s g_volume;
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int nxffs_initialize(FAR struct mtd_dev_s *mtd)
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{
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FAR struct nxffs_volume_s *volume;
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struct nxffs_blkstats_s stats;
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#ifdef CONFIG_NXFFS_SCAN_VOLUME
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struct nxffs_blkstats_s stats;
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off_t threshold;
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#endif
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int ret;
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