flash_erase vs flash_eraseall
Jon.Povey at racelogic.co.uk
Wed Sep 22 22:12:40 EDT 2010
Mike Frysinger wrote:
> On Wed, Sep 22, 2010 at 21:57, Jon Povey wrote:
>> I needed more control knobs than mtd-utils supported, I ended up
>> writing my own "flashtool" combining flash_erase and flash_write
>> features. I don't know if I can publish the source, but it does
>> things like optionally erase blocks as it goes along writing, just
>> as many as it needs, option to skip or fail on bad blocks, absolute
>> maximum offset limit, UBI image writing mode (skip trailing all-FF
>> pages in a block) and a couple of other things.
>> It can also do software-generated ECC, rearrange the data/OOB and
>> write raw (to write layouts not supported by MTD) but that's very
> usually for upgrade cycles, i let the kernel do the erase+write for me
> (/dev/mtdblock#). but i know some people would rather have a tool to
> do it for them.
Oh, I'm not very familiar with mtdblock, didn't think of it. Maybe I
could have saved some effort.
How does it handle bad blocks, I wonder out loud to the list?
I have to fail if I hit a bad block in some situations, writing images
for a tiny bootloader that can't skip bad blocks.
> in the case of the OOB, i did come across a case there too where it
> would be useful if could be transparently generated and overlaid on
> the fly ... -mike
The MTD side is pretty easy. Figuring out the inverse of the layout
transformation and implementing the ECC algorithm in software, bakes
jon.povey at racelogic.co.uk
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