[U-Boot] [PATCH] CFI: geometry reversal for STMicro M29W320DT

Richard Retanubun RichardRetanubun at RuggedCom.com
Fri Mar 6 17:30:58 CET 2009

Stefan Roese wrote:
> On Friday 06 March 2009, Richard Retanubun wrote:
>> Follow up to the flash_fixup_stm to fix geometry reversal
>> on STMicro M29W320ET flash chip. The M29W320DT has 4 erase region.
>> Signed-off-by: Richard Retanubun <RichardRetanubun at RuggedCom.com>
>> ---
>> My baseline is 2009.03-rc1. If there are STMicro/Numonyx guys on
>> this mailing list, can you help provide a more 'generic' way of
>> detection? this way the exception list does not have to grow a lot.
> Did you take a look at the Linux driver to see how this is handled there? 
> Maybe they have a more "generic" solution...
Hi Stefan,

Thanks for the comments. I took a quick look around /drivers/mtd,
but can't find a similar geometry reversal.

Unfortunately, I found this in:

	{ CFI_MFR_ST, 0x00ba, /* M28W320CT */ fixup_st_m28w320ct, NULL },
	{ CFI_MFR_ST, 0x00bb, /* M28W320CB */ fixup_st_m28w320cb, NULL },

By no means am I a CFI expert, but my impression is,
if there has to be a part number specific fixup function for any reason,
then it is a good indication that there are just some part specific peculiarity.

What utilities exist in Linux-world to do the equivalent of "flinfo" in u-boot,
just so I can see if Linux has a more generic way.

And just in case it matters, our board with these flash is MMU-less,
so if there is a different tool for uCLinux that will help too :)

- Richard

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