sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Fix SDIO DMA (finally)

Browse Source 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4409 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-02-21 19:16:41 +00:00
parent bee6686238
commit c59efdb312
2 changed files with 19 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
configs/stm3240g-eval/README.txt
View File

@ -720,9 +720,23 @@ Where <subdir> is one of the following:
configuration.
2. RS-232 is disabled, but Telnet is still available for use as a console.
Since RS-232 and SDIO use the same pins (one controlled by JP22), RS232
and SDIO cannot be used concurrently.
3. This configuration requires that jumper JP22 be set to enable SDIO operation.
4. In order to use SDIO without overruns, DMA must be used. The STM32 F4
has 192Kb of SRAM in two banks: 112Kb of "system" SRAM located at
0x2000:0000 and 64Kb of "TCM" SRAM located at 0x1000:0000. It appears
that you cannot perform DMA from TCM SRAM. The work around that I have now
is simply to omit the 64Kb of TCM SRAM from the heap so that all memory is
allocated from System SRAM. This is done by setting:
CONFIG_MM_REGIONS=1
Then DMA works fine. The downside is, of course, is that we lose 64Kb
of precious SRAM.
ostest:
------
This configuration directory, performs a simple OS test using

10
configs/stm3240g-eval/nsh2/defconfig
View File

@ -90,7 +90,7 @@ CONFIG_ARCH_BOOTLOADER=n
CONFIG_ARCH_LEDS=y
CONFIG_ARCH_BUTTONS=n
CONFIG_ARCH_CALIBRATION=n
CONFIG_ARCH_DMA=n
CONFIG_ARCH_DMA=y
#
# Identify toolchain and linker options
@ -127,7 +127,7 @@ CONFIG_STM32_CRC=n
CONFIG_STM32_BKPSRAM=n
CONFIG_STM32_CCMDATARAM=n
CONFIG_STM32_DMA1=n
CONFIG_STM32_DMA2=n
CONFIG_STM32_DMA2=y
CONFIG_STM32_ETHMAC=y
CONFIG_STM32_OTGHS=n
# AHB2:
@ -500,7 +500,7 @@ CONFIG_DEBUG_CAN=n
CONFIG_DEBUG_I2C=n
CONFIG_DEBUG_DMA=n
CONFIG_HAVE_CXX=y
CONFIG_MM_REGIONS=2
CONFIG_MM_REGIONS=1
CONFIG_ARCH_LOWPUTC=y
CONFIG_RR_INTERVAL=200
CONFIG_SCHED_INSTRUMENTATION=n
@ -598,7 +598,7 @@ CONFIG_DISABLE_SIGNALS=n
CONFIG_DISABLE_MQUEUE=n
CONFIG_DISABLE_MOUNTPOINT=n
CONFIG_DISABLE_ENVIRON=n
CONFIG_DISABLE_POLL=y
CONFIG_DISABLE_POLL=n
#
# Misc libc settings
@ -782,7 +782,7 @@ CONFIG_FS_WRITEBUFFER=n
# CONFIG_MMCSD_HAVECARDDETECT
# SDIO driver card detection is 100% accurate
#
CONFIG_SDIO_DMA=n
CONFIG_SDIO_DMA=y
#CONFIG_SDIO_PRI=128
#CONFIG_SDIO_DMAPRIO
#CONFIG_SDIO_WIDTH_D1_ONLY