Hi Heiko,
Hello Scott,
Am 25.05.2016 um 07:33 schrieb Scott Wood:
On 05/25/2016 12:07 AM, Heiko Schocher wrote:
writting to ubi nand partitions need after write ends an erase of the remaining sectors. This fail, if dfu write size was not a multiple of erasesize, example log:
Failure erase: -1
Is this a new bug? Or is this a regression?
Fix this error.
Signed-off-by: Heiko Schocher hs@denx.de
Why don't you just erase the whole partition up front?
Good question ... I think the reason is that if we erase a big partition at once on dfu start, dfu-util rans into timeout ... but may I am wrong ...
This is interesting, since we had similar problem with eMMC, but on the end of writing large files to FS.
To fix this issue, the deferred write has been introduced [1]: SHA1: fc18f8d170ecc7e15269ad5312ec643addb42491
IIRC at the end of a DFU transfer DFU protocol sends a "flush" to the device ...
Yes, correct, we do that.
where we currently erase the remaining sectors
I'm not the "regular" user of NAND part of DFU framework. However, AFAIK each sector is erased just before writing (dfu_nand.c @ line 62).
The same scheme should be performed just before writing last chunk of data to NAND.
... we need this on an ubi partition, else there may remain old used UBI sectors ... (BTW: we need an "ubi format" command ...)
@Lukasz? Am I correct? Or could we simple erase before writting?
I'm just wondering if have you tried erasing the whole NAND area before starting DFU operation? How long does it take to erase large NAND area for e.g. rootfs?
If I remember correctly, the timeout in dfu-util is 5 seconds sharp.
Generally, I'm fine with erasing NAND sectors just before writing (as we do it up till now in the NAND part of DFU).
bye, Heiko