[U-Boot] U-boot environment on Sheevaplug
Hi Prafulla (and the list)!
I'm wondering a bit how Sheevaplug handles the U-boot environment area. On OpenRD base it's stored on the NAND flash, and is protected by a 4-bit ECC as required when read by the boot prom - it just goes together with the rest of the u-boot image.
The Marvell-supplied 1.1.4 version has code to handle this (basically switches to Reed-Solomon when reading/saving the environment), but it doesn't work with upstream U-boot. If I disable ECC altogether (in kirkwood_nand.c) I can read the environment, but since U-boot doesn't use Reed-Solomon, the soft ECC option doesn't cut it.
Is the situation the same with sheevaplug? I see there are patches for OpenOCD to handle the same thing there,
http://lists.berlios.de/pipermail/openocd-development/2009-May/006413.html
so perhaps something similar is bound for U-boot as well?
// Simon
Hi again!
I just wanted to check if there has been any progress on the issue below (4-bit ECC support to read for the kernel / U-boot) during the summer.
On Wed, 8 Jul 2009 15:59:27 +0200 Simon Kagstrom simon.kagstrom@netinsight.net wrote:
Hi Prafulla (and the list)!
I'm wondering a bit how Sheevaplug handles the U-boot environment area. On OpenRD base it's stored on the NAND flash, and is protected by a 4-bit ECC as required when read by the boot prom - it just goes together with the rest of the u-boot image.
The Marvell-supplied 1.1.4 version has code to handle this (basically switches to Reed-Solomon when reading/saving the environment), but it doesn't work with upstream U-boot. If I disable ECC altogether (in kirkwood_nand.c) I can read the environment, but since U-boot doesn't use Reed-Solomon, the soft ECC option doesn't cut it.
Is the situation the same with sheevaplug? I see there are patches for OpenOCD to handle the same thing there,
http://lists.berlios.de/pipermail/openocd-development/2009-May/006413.html
so perhaps something similar is bound for U-boot as well?
// Simon
-----Original Message----- From: Simon Kagstrom [mailto:simon.kagstrom@netinsight.net] Sent: Tuesday, August 25, 2009 1:00 PM To: U-Boot ML Cc: Prafulla Wadaskar; Nicolas Pitre Subject: Re: [U-Boot] U-boot environment on Sheevaplug
Hi again!
I just wanted to check if there has been any progress on the issue below (4-bit ECC support to read for the kernel / U-boot) during the summer.
Hi Simon For u-boot, so far no progress for this :-( Regards.. Prafulla .
-----Original Message----- From: Simon Kagstrom [mailto:simon.kagstrom@netinsight.net] Sent: Tuesday, August 25, 2009 1:00 PM To: U-Boot ML Cc: Prafulla Wadaskar; Nicolas Pitre Subject: Re: [U-Boot] U-boot environment on Sheevaplug
Hi again!
I just wanted to check if there has been any progress on the issue below (4-bit ECC support to read for the kernel / U-boot) during the summer.
Hi Simon
I am restarting work on this issue for u-boot, Does anybody have any suggestions? Those are welcomed..
Regards.. Prafulla . .
On Wed, 8 Jul 2009 15:59:27 +0200 Simon Kagstrom simon.kagstrom@netinsight.net wrote:
Hi Prafulla (and the list)!
I'm wondering a bit how Sheevaplug handles the U-boot
environment area.
On OpenRD base it's stored on the NAND flash, and is protected by a 4-bit ECC as required when read by the boot prom - it just goes together with the rest of the u-boot image.
The Marvell-supplied 1.1.4 version has code to handle this
(basically
switches to Reed-Solomon when reading/saving the
environment), but it
doesn't work with upstream U-boot. If I disable ECC altogether (in kirkwood_nand.c) I can read the environment, but since
U-boot doesn't
use Reed-Solomon, the soft ECC option doesn't cut it.
Is the situation the same with sheevaplug? I see there are
patches for
OpenOCD to handle the same thing there,
http://lists.berlios.de/pipermail/openocd-development/2009-May /006413.html
so perhaps something similar is bound for U-boot as well?
// Simon
On Thu, 3 Sep 2009 23:20:02 -0700 Prafulla Wadaskar prafulla@marvell.com wrote:
I just wanted to check if there has been any progress on the issue below (4-bit ECC support to read for the kernel / U-boot) during the summer.
I am restarting work on this issue for u-boot, Does anybody have any suggestions? Those are welcomed..
Good to hear!
I guess a starting point could be Nicolas patch for this to OpenOCD:
http://lists.berlios.de/pipermail/openocd-development/2009-May/006413.html
and/or the Reed-Solomon library in the Linux kernel, lib/reed_solomon/{reed_solomon.c, decode_rs.c, encode_rs.c} (I guess this will be needed to perform error correction and decoding as well).
// Simon
-----Original Message----- From: Simon Kagstrom [mailto:simon.kagstrom@netinsight.net] Sent: Tuesday, August 25, 2009 1:00 PM To: U-Boot ML Cc: Prafulla Wadaskar; Nicolas Pitre Subject: Re: [U-Boot] U-boot environment on Sheevaplug
Hi again!
I just wanted to check if there has been any progress on the issue below (4-bit ECC support to read for the kernel / U-boot) during the summer.
On Wed, 8 Jul 2009 15:59:27 +0200 Simon Kagstrom simon.kagstrom@netinsight.net wrote:
Hi Prafulla (and the list)!
I'm wondering a bit how Sheevaplug handles the U-boot
environment area.
On OpenRD base it's stored on the NAND flash, and is protected by a 4-bit ECC as required when read by the boot prom - it just goes together with the rest of the u-boot image.
The Marvell-supplied 1.1.4 version has code to handle this
(basically
switches to Reed-Solomon when reading/saving the
environment), but it
doesn't work with upstream U-boot. If I disable ECC altogether (in kirkwood_nand.c) I can read the environment, but since
U-boot doesn't
use Reed-Solomon, the soft ECC option doesn't cut it.
Hi Simon As of now u-boot as well as Linux kernel supports only 1-bit ECC for Kirkwood. There are efforts going on to make 4-bit ECC support available for Kirkwood on Linux. Once this available, I will make it available on u-boot.
Meanwhile you can replace oob_softecc_kw with oob_softecc in openocd board config file to make it in sync with u-boot and kernel. This will ensure openocd to write NAND with 1-bit ECC.
Regards.. Prafulla . .
Is the situation the same with sheevaplug? I see there are
patches for
OpenOCD to handle the same thing there,
http://lists.berlios.de/pipermail/openocd-development/2009-May /006413.html
so perhaps something similar is bound for U-boot as well?
// Simon
participants (2)
-
Prafulla Wadaskar -
Simon Kagstrom