From: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
To: Josh Boyer <jwboyer@gmail.com>
Cc: linux-mtd@lists.infradead.org
Subject: Re: Different erase block sizes in a JFFS2 partion.
Date: Fri, 29 Sep 2006 08:43:36 +0200 [thread overview]
Message-ID: <451CC098.7050805@transmode.se> (raw)
In-Reply-To: <625fc13d0609281607l5d2ad581k9615afa8d4f3caa@mail.gmail.com>
Josh Boyer wrote:
> On 9/28/06, Joakim Tjernlund <joakim.tjernlund@transmode.se> wrote:
>> Got multiple NOR chips with top and bottom boot blocks with diffrent EB size
>> then the rest of the blocks.
>
> Intel P30? IIRC, the MTD driver maps those into a set of larger
> virtual eraseblocks. You might not be able to even distinguish that
> they exist.
yes, Intel P30.
The cfi_cmdset_0001 driver maps them like this:
0: offset=0x0,size=0x8000,blocks=4
1: offset=0x20000,size=0x20000,blocks=255
2: offset=0x2000000,size=0x8000,blocks=4
3: offset=0x2020000,size=0x20000,blocks=255
First, this map is wrong. 2: and 3: should be swapped, that is,
the small blocks should be at the end of the device.
the small blocks fits into a larger one so I should have no problem reading/writing
to such virtual block, but I don't think erase will work as JFFS2 will
only erase one of the small blocks instead of all 4. Maybe I am missing something?
prev parent reply other threads:[~2006-09-29 6:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-28 21:55 Different erase block sizes in a JFFS2 partion Joakim Tjernlund
2006-09-28 23:07 ` Josh Boyer
2006-09-29 6:43 ` Joakim Tjernlund [this message]
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