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Date: Sun, 26 Feb 2006 12:25:22 +0300
From: "Alexey, Korolev" <alexey.korolev@intel.com>
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To: Kein Yuan <kein.yuan@gmail.com>, linux-mtd@lists.infradead.org
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Subject: Re: Strange problem with JFFS2/MTD on Linux 2.6.9 ith Intel J3 Flash
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Kein Yuan wrote:

> I am working on a PXA270 based paltform with Intel J3 Flash on Linux
> 2.6.9.  I am sure that jffs2 image was written into the correct place
> and verified by md5chk command in blob, but somehow kernel can detect
> flash, can dump out the context correctly but failed to mount  the
> flash partition as my root filesystem.  Can anybody here give me some
> hints?    The boot log was pasted as below:
>
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00037ef4:
> 0x9f54 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0003f070:
> 0xf960 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00040004:
> 0x085c instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00080004:
> 0x1860 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x000d2bb4:
> 0x0001 instead
> jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0012a370:
> 0x006e instead
>
It possible that you specified erase block size improperly when you 
created image of JFFS2 file system. Size of erase block can be specified 
through -e parameter of mkfs.jffs2 utility.
Erase block size can be obtained using blob. (On attmempt to write 
something blob should display size of erase block)

Thanks,
Alexey