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backport a serial console fix from the sam4e to the sama5d3

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This commit is contained in:
Gregory Nutt 2014-03-25 14:34:07 -06:00
parent d6c0df5abc
commit f99990579d
1 changed files with 16 additions and 2 deletions
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18
configs/sam4e-ek/README.txt
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@ -660,7 +660,8 @@ USB Full-Speed Device
b. If you change the value CONFIG_SYSTEM_USBMSC_DEVPATH1, then you
can export other file systems:
"/dev/mmcsd0" would export the HSMCI SD slot
"/dev/mmcsd0" would export the HSMCI SD slot (not currently available,
see the "HSMCI" section).
"/dev/ram0" could even be used to export a RAM disk. But you would
first have to use mkrd to create the RAM disk and mkfatfs to put
@ -781,6 +782,14 @@ HSMCI
The SD card contents will then be available under /mnt/sdcard.
NOTES:
1. DMA is not currently functional and without DMA, there may not be
reliable data transfers at high speeds due to data overrun problems.
The current HSMCI driver supports DMA via the DMAC. However, the data
sheet only discusses PDC-based HSMCI DMA (although there is a DMA
channel interface definition for HSMCI).
Touchscreen
===========
@ -1171,7 +1180,12 @@ Configurations
instructions provided above in the paragraph entitled "HSMCI."
STATUS:
2014-3-21: The HSMCI SD card slot has not yet been tested.
2014-3-24: DMA is not currently functional and without DMA, there
may not be reliable data transfers at high speeds due
to data overrun problems. The current HSMCI driver
supports DMA via the DMAC. However, the data sheet
only discusses PDC-based HSMCI DMA (although there is
a DMA channel interface definition for HSMCI).
usbnsh: