Re: [PATCH 2/2] MEMSTICK: Add driver for Ricoh R5C592 Card reader.
From: Maxim Levitsky
Date: Sat Aug 07 2010 - 16:22:56 EST
I have few more questions about memsticks.
First of all, I need an explanation of overwrite flag.
You already explained it to me once, but I still not sure about few
#define MEMSTICK_OVERWRITE_UDST 0x10
This one I understand, thinking about xD again, I think it is very
My idea (from xD of course) is that copyonwrite is done this way:
1. read old sector
2. allocate new sector
2. write what was just read to new sector.
3. erase old sector.
Could you explain when I need to set and reset the
#define MEMSTICK_OVERWRITE_PGST1 0x20
#define MEMSTICK_OVERWRITE_PGST0 0x40
I suppose these indicate that page(sector) contains incorrect data, just
like in xD there is page status?
Again, better explanation is welcome.
Also, should I touch that flag when I update sector?
#define MEMSTICK_OVERWRITE_BKST 0x80
This marks bad blocks?
Another question is about write of oob data.
When I write it, overwrite flag is updated, or I need to use
MEMSTICK_CP_OVERWRITE to update it?
I think former is true.
When I write a sector, I just write 0 to management flag, right?
And last question,
If I use MEMSTICK_CP_BLOCK, can I start reading a block from non-zero
And surely last question, what is 'MS_CMD_BLOCK_END'
Thanks again for all help so far,
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