Am3703: BCH4 differs in kernel and uboot

Arno Steffens

Used until now 1 bit SW-ECC, but have to use a better protection. So I would like to switch to BCH4 in SW (use both Omap3 and Sitara Am37xx).

The old kernel doesn't Support BCH4, but I found a paper from Micron to update it. (TN-29-71: Enabling Software BCH ECC on a Linux Platform Source Code Changes)

This seems to work, but I found that although the position and number of Bytes in OOB is identical, the EEC data arn't.

Any idea how to make xloader and uboot compatible to the Linux way of calculating BCH4 (or other way around)?

over 11 years ago

0 Miroslav Kiradzhiyski XID over 11 years ago

TI__Mastermind 25235 points

Hi,

Please post which U-Boot and linux kernel versions you are using.

Best regards,
Miroslav

0 Arno Steffens over 11 years ago in reply to Miroslav Kiradzhiyski XID

Intellectual 930 points

Sorry, I missed that:

Kernel is a 2.6.33 (added bch.c and bch.h from a newer kernel) and adaptations as decribed in TN.

http://git.kernel.org/?p=linux/kernel/git/tmlind/linux

omap-2.6.git;a=snapshot;h=60b341b778cc2929df16c0a504c91621b3c6a4ad;sf=tgz

Uboot and Xloader are from the

http://arago-project.org/git/projects/?p=x-load-omap3.git;a=commit;h=273d7fa3f627a1c5219ad21e47f50693fca0549f

http://arago-project.org/git/projects/?p=u-boot-omap3.git;a=commit;h=ae5aaebb687e4810ed1ea6961cbbd0fbd31f2c35
but added with some patches TI released in Juli 2011 with PSP 4.02.00.07

0 Miroslav Kiradzhiyski XID over 11 years ago in reply to Arno Steffens

TI__Mastermind 25235 points

Arno,

I have asked the factory team to assist and give suggestions about your issue.

Best regards,
Miroslav

0 Arno Steffens over 11 years ago in reply to Miroslav Kiradzhiyski XID

Intellectual 930 points

Thanks, I hope someone can help me with this issue.

0 Arno Steffens over 11 years ago in reply to Arno Steffens

Intellectual 930 points

Thanks TI for your great help!

(irony off).

I could get the uboot work with BCH4 in "Linux style". Also switching forth and back to 1bit-SW ECC works. A Problem for me keeps the X-Loader, as functions there have different Interfaces, names ....

Would be much more easier guys, if one of you could explain the difference in BCH4 calculation. Hey, someone out there reading here? Honestly, I don't understand why this is so diffcult to help users here.

0 Miroslav Kiradzhiyski XID over 11 years ago in reply to Arno Steffens

TI__Mastermind 25235 points

Hi Arno,

Sorry for the delayed response. The factory team have their own priority schedules, they try to answer questions on the forum alongside these. I have searched the forum and camе across this post, which may explain your issue with x-loader: http://e2e.ti.com/support/arm/sitara_arm/f/791/p/116753/415615.aspx#415615

Best regards,
Miroslav

0 Arno Steffens over 11 years ago in reply to Miroslav Kiradzhiyski XID

Intellectual 930 points

Mh, this thread you refer is mixed. It's started with differences between hw1 and hw2 and switches over to other topics.

Only interesting post is from Hrishikesh Bhandiwad77881 who's mentioned BCH4 for kernel and uboot.

Would be good to know, what is his Hardware/Software base.

For me position of OOB/ECC Bytes are not a problem, as decribed in others peoples posts. Position and size fits, but the algo not.

I tried to contact the authors of xloaders omap_bch_Decoder, ( * Author: Sukumar Ghorai <s-ghorai@ti.com
* Michael Fillinger m-fillinger@ti.com) but with no success.

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Am3703: BCH4 differs in kernel and uboot