Re: [openwince-list] Program a flash block in multiple chunks with jtag

[Gregory H. <hei...@es...>]

there's two reasons why I got interested in this:
- first: when you program something into flash, and there
  is a verify error, it's a bit of a pity having to=20
  reprogram everything just because a couple of bits
  were wrong,
- second: if you have a large chunk of data you want to keep
  and just want to alter a few words, then it is inefficient
  to have to reprogram everything.

Maybe it would be more optimal to:
- modify the verification code so that instead of returning
  an error message, it erases the few words that were wrong
  and reprograms them with the appropriate value,
- add an option in the flashmem command in which you
  can specify which programming method you want to use:
  * erase whole block and program flash
  * or, do not erase block, but perform erase cycles instead
  you could use the former for flashing a big file, or the
  latter for flashing a small file when there's already
  another big file in the same block.
I can try to implement it, but I'd like to know if it sounds
reasonable.

Thanks,
Greg.

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> On 2003.06.19 12:16, Gregory Heinrich wrote:
> > Hi Marcel,
> > thanks for your very well detailed answers.
> > My understanding is that I can erase a block (e.g. block 0) then
> > program part of this block (0x0 to 0x3ff) then another part of the
> > same block (0x400 to 0x7ff) and this will work fine.
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> Yes. True.
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> >=20
> > However, it won't work if I want to alter
> > a given part of this block (e.g. I want to keep what was in 0x0 to
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> True. This is not possible with Intel StrataFlash.
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> > 0x3ff but I want to alter 0x400 to 0x7ff). The workaround for this
> > is to add an erase cycle before every single work I want to write,
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> Yes.
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> > thus
> > making flash programming about twice as slow. So this is not
useful
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> More than twice. Erasing is very slow.
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> > if you have a block composed of two halves, but this starts being
> > interesting if you have a large chunk you want to keep and a small
> > chunk you want to alter.
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> True.
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> >=20
> > Is that right?
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> Yes.
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> --=20
> +-------------------------------------------+
> | Marcel Telka   e-mail:   ma...@te...  |
> |                homepage: http://telka.sk/ |
> |                jabber:   ma...@ja... |
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