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SAMA5 HSMCI: e-enable TX DMA and verify that DMA writes to the SD card are functional. They are so now TX DMA is re-enabled in the driver. This might affect the SAMA5D3 platforms where the TX DMA problem was found. The SAMA4D3 and 4 use the same HSMCI driver. Much has change since then and it is not surprising that DMA is now functional. However, the has not be re-verified on the SAMA5D3 which has a different DMA controller.

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This commit is contained in:
Gregory Nutt 2014-07-30 11:20:06 -06:00
parent bb06d31038
commit 276cc44878
4 changed files with 96 additions and 45 deletions
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8
arch/arm/src/sama5/sam_hsmci.c
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@ -181,12 +181,10 @@
# endif
#endif
/* TX-DMA is not reliable. Often, the TX DMA will hang after transferring 64 bytes or so.
* I don't have any clue why at the moment. This option suppresses TX DMA (only).
*/
/* These were once helpful. Perhaps they will be so again some time. */
#undef HSCMI_NORXDMA
#define HSCMI_NOTXDMA 1
#undef HSCMI_NORXDMA /* Define to disable RX DMA */
#undef HSCMI_NOTXDMA /* Define to disable TX DMA */
/* Timing */

43
configs/sama5d3-xplained/README.txt
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@ -64,6 +64,7 @@ Contents
- Networking
- AT25 Serial FLASH
- HSMCI Card Slots
- Auto-Mounter
- USB Ports
- USB High-Speed Device
- USB High-Speed Host
@ -1086,6 +1087,9 @@ HSMCI Card Slots
nsh> cat /mnt/sd1/atest.txt
This is a test
NOTE: See the next section entitled "Auto-Mounter" for another way
to mount your SD card.
4) Before removing the card, you must umount the file system. This is
equivalent to "ejecting" or "safely removing" the card on Windows: It
flushes any cached data to the card and makes the SD card unavailable
@ -1098,6 +1102,29 @@ HSMCI Card Slots
volume when it is removed. But those callbacks are not used in
these configurations.
Auto-Mounter
============
NuttX implements an auto-mounter than can make working with SD cards
easier. With the auto-mounter, the file system will be automatically
mounted when the SD card is inserted into the HSMCI slot and automatically
unmounted when the SD card is removed.
The auto-mounter is enable with:
CONFIG_FS_AUTOMOUNTER=y
However, to use the automounter you will to provide some additional
board-level support. See configs/sama5d4-ek for and example of how
you might do this.
WARNING: SD cards should never be removed without first unmounting
them. This is to avoid data and possible corruption of the file
system. Certainly this is the case if you are writing to the SD card
at the time of the removal. If you use the SD card for read-only access,
however, then I cannot think of any reason why removing the card without
mounting would be harmful.
USB Ports
=========
@ -2792,13 +2819,17 @@ To-Do List
endpoint support in the EHCI driver is untested (but works in similar
EHCI drivers).
2) HSCMI TX DMA support is currently commented out.
2) HSCMI. CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers because of some issues that I saw during testing. The is very
low priority to me but might be important to you if you are need very
high performance SD card accesses.
Also, CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers.
Both of these issues need to be revisited to determine there is or
is not a real problem.
The last time I used HSMCI with a SAMA5D3, I had to disable TX DMA
in the HSMCI driver. Much has changed since then and I have reverified
that TX DMA transfers are functional using a SAMA5D4. The SAMA5D4,
however, has a different DMA subsystem. So... if you suspect issues
HSMCI writes, you might try disabling the TX DMA again in the
sam_hsmci.c driver.
3) GMAC has only been tested on a 10/100Base-T network. I don't have a
1000Base-T network to support additional testing.

73
configs/sama5d3x-ek/README.txt
View File

@ -76,6 +76,7 @@ Contents
- Networking
- AT25 Serial FLASH
- HSMCI Card Slots
- Auto-Mounter
- USB Ports
- USB High-Speed Device
- USB High-Speed Host
@ -1245,6 +1246,9 @@ HSMCI Card Slots
nsh> cat /mnt/sd1/atest.txt
This is a test
NOTE: See the next section entitled "Auto-Mounter" for another way
to mount your SD card.
4) Before removing the card, you must umount the file system. This is
equivalent to "ejecting" or "safely removing" the card on Windows: It
flushes any cached data to the card and makes the SD card unavailable
@ -1257,6 +1261,29 @@ HSMCI Card Slots
volume when it is removed. But those callbacks are not used in
these configurations.
Auto-Mounter
============
NuttX implements an auto-mounter than can make working with SD cards
easier. With the auto-mounter, the file system will be automatically
mounted when the SD card is inserted into the HSMCI slot and automatically
unmounted when the SD card is removed.
The auto-mounter is enable with:
CONFIG_FS_AUTOMOUNTER=y
However, to use the automounter you will to provide some additional
board-level support. See configs/sama5d4-ek for and example of how
you might do this.
WARNING: SD cards should never be removed without first unmounting
them. This is to avoid data and possible corruption of the file
system. Certainly this is the case if you are writing to the SD card
at the time of the removal. If you use the SD card for read-only access,
however, then I cannot think of any reason why removing the card without
mounting would be harmful.
USB Ports
=========
@ -3020,7 +3047,7 @@ Configurations
configurations because most testing was done at 396MHz. NAND has not
been verified at these rates.
5. By default, all of these configurations run from ISRAM or NOR FLASH
5. By default, all of these configurations run from ISRAM or NOR FLASH
(as indicated below in each description of the configuration).
Operation from SDRAM is also an option as described in the paragraph
entitled, "Running NuttX from SDRAM."
@ -3464,19 +3491,23 @@ To-Do List
booting directly into NOR FLASH. So although I cannot confirm this
behavior, this appears to be no longer an issue.
3) Neither USB OHCI nor EHCI support Isochronous endpoints. Interrupt
2) Neither USB OHCI nor EHCI support Isochronous endpoints. Interrupt
endpoint support in the EHCI driver is untested (but works in similar
EHCI drivers).
4) HSCMI TX DMA support is currently commented out.
3) HSCMI. CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers because of some issues that I saw during testing. The is very
low priority to me but might be important to you if you are need very
high performance SD card accesses.
Also, CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers.
The last time I used HSMCI with a SAMA5D3, I had to disable TX DMA
in the HSMCI driver. Much has changed since then and I have reverified
that TX DMA transfers are functional using a SAMA5D4. The SAMA5D4,
however, has a different DMA subsystem. So... if you suspect issues
HSMCI writes, you might try disabling the TX DMA again in the
sam_hsmci.c driver.
Both of these issues need to be revisited to determine there is or
is not a real problem.
5) I believe that there is an issue when the internal AT25 FLASH is
4) I believe that there is an issue when the internal AT25 FLASH is
formatted by NuttX. That format works fine with Linux, but does not
appear to work with Windows. Reformatting on Windows can resolve this.
NOTE: This is not a SAMA5Dx issue.
@ -3485,30 +3516,30 @@ To-Do List
formatting function (mkfatfs). It is likely that these fixes will
eliminate this issue, but that has not yet been verified.
6) CAN testing has not yet been performed due to issues with cabling. I
5) CAN testing has not yet been performed due to issues with cabling. I
just do not have a good test bed (or sufficient CAN knowledge) for
good CAN testing.
7) There are lots of LCDC hardware features that are not tested with NuttX.
6) There are lots of LCDC hardware features that are not tested with NuttX.
The simple NuttX graphics system does not have support for all of the
layers and other features of the LCDC.
8) I have a Camera, but there is still no ISI driver. I am not sure what to
7) I have a Camera, but there is still no ISI driver. I am not sure what to
do with the camera. NuttX needs something like V4L to provide the
definition for what a camera driver is supposed to do.
I will probably develop a test harness for ISI, but it is of only
minimal value with no OS infrastructure to deal with images and video.
9) GMAC has only been tested on a 10/100Base-T network. I don't have a
8) GMAC has only been tested on a 10/100Base-T network. I don't have a
1000Base-T network to support additional testing.
10) Some drivers may require some adjustments if you intend to run from SDRAM.
That is because in this case macros like BOARD_MCK_FREQUENCY are not constants
but are instead function calls: The MCK clock frequency is not known in
advance but instead has to be calculated from the bootloader PLL configuration.
9) Some drivers may require some adjustments if you intend to run from SDRAM.
That is because in this case macros like BOARD_MCK_FREQUENCY are not constants
but are instead function calls: The MCK clock frequency is not known in
advance but instead has to be calculated from the bootloader PLL configuration.
As of this writing, all drivers have been converted to run from SDRAM except
for the PWM and the Timer/Counter drivers. These drivers use the
BOARD_MCK_FREQUENCY definition in more complex ways and will require some
minor redesign and re-testing before they can be available.
As of this writing, all drivers have been converted to run from SDRAM except
for the PWM and the Timer/Counter drivers. These drivers use the
BOARD_MCK_FREQUENCY definition in more complex ways and will require some
minor redesign and re-testing before they can be available.

17
configs/sama5d4-ek/README.txt
View File

@ -3792,10 +3792,6 @@ Configurations
The auto-mounter is also enabled. See the section above entitled
"Auto-Mounter".
STATUS: Seems to be completely functional. TX DMA is currently
disabled; there was a problem at one time but that has probably
been fixed. HSCMI with TX DMA re-enabled needs to be verified.
13. Networking is supported via EMAC0. See the "Networking" section
above for detailed configuration settings. DHCP is not used in
this configuration; rather, a hard-coded IP address of 10.0.0.2 is
@ -4222,15 +4218,10 @@ To-Do List
endpoint support in the EHCI driver is untested (but works in similar
EHCI drivers).
2) HSCMI TX DMA support is currently commented out. There were problems at
one time (on the SAMA5D3) and the temporary workaround was simply to
disable TX DMA. There have been several fixes to both HSMCI and DMA
support since then and TX DMA is very likely okay now. But this needs
to be verified by re-enabled HSMCI TX DMA.
Also, CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers. The is very low priority to me but might be important to you
if you are need very high performance SD card accesses.
2) HSCMI. CONFIG_MMCSD_MULTIBLOCK_DISABLE=y is set to disable multi-block
transfers because of some issues that I saw during testing. The is very
low priority to me but might be important to you if you are need very
high performance SD card accesses.
3) There is a kludge in place in the Ethernet code to work around a problem
that I see. The problem that I see is as follows: