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Update README files

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This commit is contained in:
Gregory Nutt 2015-11-30 17:37:01 -06:00
parent 2e78fc7178
commit fba809d7c8
2 changed files with 17 additions and 2 deletions
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10
configs/same70-xplained/README.txt
View File

@ -115,6 +115,11 @@ Any of these options can be selected as the serial console by:
2. Configuring the peripheral in the "Drivers -> Serial Configuration"
menu.
NOTE: If USART1 is used (TXD1, RXD1), then PB4 must be reconfigured in the
SUPC. Normally, PB4 is TDI. When it is reconfigured for use with USART1,
the capability to debug is lost! If you plan to debug you should most
certainly not use USARTs.
SD Card
=======
@ -618,6 +623,11 @@ settings:
CONFIG_SAMV7_USBHS_NDTDS=32 : Number of DMA transfer descriptors
CONFIG_SAMV7_USBHS_PREALLOCATE=y : Pre-allocate descriptors
As discussed in the SAMV71-XULT README, this driver will not work correctly
if the write back data cache is enabled. You must have:
CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y
In order to be usable, you must all enabled some class driver(s) for the
USBHS device controller. Here, for example, is how to configure the CDC/ACM
serial device class:

9
configs/samv71-xult/README.txt
View File

@ -236,6 +236,11 @@ Any of these options can be selected as the serial console by:
2. Configuring the peripheral in the "Drivers -> Serial Configuration"
menu.
NOTE: If USART1 is used (TXD1, RXD1), then PB4 must be reconfigured in the
SUPC. Normally, PB4 is TDI. When it is reconfigured for use with USART1,
the capability to debug is lost! If you plan to debug you should most
certainly not use USARTs.
SD Card
=======
@ -938,9 +943,9 @@ settings:
CONFIG_SAMV7_USBHS_PREALLOCATE=y : Pre-allocate descriptors
As noted above, this driver will not work correctly if the write back
data cache is enable:
data cache is enabled. You must have:
CONFIG_ARMV7M_DCACHE_WRITETHROUGH=n
CONFIG_ARMV7M_DCACHE_WRITETHROUGH=y
In order to be usable, you must all enabled some class driver(s) for the
USBHS device controller. Here, for example, is how to configure the CDC/ACM