[U-Boot] [0/6] Patch serie UBI min I/O size fixes
This patch serie fixes a problem in the UBI layer. The min I/O size has currently a fixed value of 1 for NOR flashes. But for NOR flashes the min I/O size has to be equal to the size of the writebuffer of the flash. Therefore the mtd layer was enhanced with the writebuffer which was later on used in the ubi layer to set the min I/O size.
This patches fixes problems with flash types with a writebuffersize > 128 Byte and is mainly taken from the similar linux patches. See MTD mailing list posts: http://lists.infradead.org/pipermail/linux-mtd/2010-December/033460.html
Without the u-boot patches attaching to a ubi device with a min I/O buffer larger than 128 would fail.
Best Regards
Hi Holger,
On Thursday 20 January 2011 17:16:32 Holger Brunck wrote:
This patch serie fixes a problem in the UBI layer. The min I/O size has currently a fixed value of 1 for NOR flashes. But for NOR flashes the min I/O size has to be equal to the size of the writebuffer of the flash. Therefore the mtd layer was enhanced with the writebuffer which was later on used in the ubi layer to set the min I/O size.
This patches fixes problems with flash types with a writebuffersize > 128 Byte and is mainly taken from the similar linux patches. See MTD mailing list posts: http://lists.infradead.org/pipermail/linux-mtd/2010-December/033460.html
Without the u-boot patches attaching to a ubi device with a min I/O buffer larger than 128 would fail.
IIRC (please correct me if I'm wrong), the Linux part of these patches has undergone some changes. Is this U-Boot patch series still up-to-date?
Cheers, Stefan
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Hi Stefan,
Stefan Roese wrote:
Hi Holger,
On Thursday 20 January 2011 17:16:32 Holger Brunck wrote:
This patch serie fixes a problem in the UBI layer. The min I/O size has currently a fixed value of 1 for NOR flashes. But for NOR flashes the min I/O size has to be equal to the size of the writebuffer of the flash. Therefore the mtd layer was enhanced with the writebuffer which was later on used in the ubi layer to set the min I/O size.
This patches fixes problems with flash types with a writebuffersize > 128 Byte and is mainly taken from the similar linux patches. See MTD mailing list posts: http://lists.infradead.org/pipermail/linux-mtd/2010-December/033460.html
Without the u-boot patches attaching to a ubi device with a min I/O buffer larger than 128 would fail.
IIRC (please correct me if I'm wrong), the Linux part of these patches has undergone some changes. Is this U-Boot patch series still up-to-date?
no. The assumption that (mtd->writebufsize == min I/O size in UBI) for NOR flashes was incorrect and the patch UBI: use mtd->writebufsize to set minimal I/O unit size was reverted in the mainline kernel. Whats still part in the kernel is the enhancement of the mtd struct with the writebufsize. But also in this topic some changes are made. So the patch series should be dropped or updated with the recent changes.
But currently due to the changes I did not see a usage for this additional value for u-boot. For this reason I propose to drop the patch series.
Best regards Holger
participants (2)
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Holger Brunck -
Stefan Roese