Hi,
DFU spec mentions it as a method to upgrade firmware (software stored
in writable non-volatile memory). It also says other potential uses of
DFU is beyond scope of the spec.
Here such a beyond the scope use is being attempted - directly pumping
binary images from host via USB to RAM. This facility is a developer
centric one in that it gives advantage over upgrading non-volatile
memory for testing new images every time during development and/or
testing.
Directly putting image onto RAM would speed up upgrade process. This and
convenience was the initial thoughts that led to doing this, speed
improvement over MMC was only 1 second though - 6 sec on RAM as opposed
to 7 sec on MMC in beagle bone, perhaps enabling cache and/or optimizing
DFU framework to avoid multiple copy for ram (if worth) may help, and
on other platforms and other boot media like NAND maybe improvement
would be higher.
And for a platform that doesn't yet have proper DFU suppport for
non-volatile media's, DFU to RAM can be used.
Another minor advantage would be to increase life of mmc/nand as it
would be less used during development/testing.
usage: <image name> ram <start address> <size>
eg. kernel ram 0x81000000 0x1000000
Downloading images to RAM using DFU is not something new, this is
acheived in openmoko also.
DFU on RAM can be used for extracting RAM contents to host using dfu
upload. Perhaps this can be extended to io for squeezing out register
dump through usb, if it is worth.
In addition to ram support, a minor unification of dfu read/write enum's
currently duplicated in mmc/nand is done, helping ram support too.
Also dfu ram support is added for am335x SoC based boards.
Based on: usb master branch
Regards
Afzal
v5:
add README entry
collect additional tags
v4:
avoid doing prefix increment in argument of simple_strtoul()
collect more tags
v3: collected tags, error used instead of printf
v2: unified read/write dfu ops enum, added am335x support
Afzal Mohammed (3):
dfu: unify mmc/nand read/write ops enum
dfu: ram support
am335x_evm: enable DFU RAM
README | 6 ++++
drivers/dfu/Makefile | 1 +
drivers/dfu/dfu.c | 7 ++--
drivers/dfu/dfu_mmc.c | 9 ++----
drivers/dfu/dfu_nand.c | 7 +---
drivers/dfu/dfu_ram.c | 77 ++++++++++++++++++++++++++++++++++++++++++++
include/configs/am335x_evm.h | 6 ++++
include/dfu.h | 23 +++++++++++++
8 files changed, 121 insertions(+), 15 deletions(-)
create mode 100644 drivers/dfu/dfu_ram.c
--
1.8.2.135.g7b592fa
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