Mity CPU Platforms » MitySOM-335x (ARM Cortex-A8 Based Products)

06/24/2014

JC 05:19 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

That is what I'm suggesting. You can verify if this is the issue by running the 'nand dump' or 'nand read' command and looking for any reported fixed bitflips.
Note you can try this from linux as well. The -n option should allow you... Jonathan Cormier

05:07 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

So let me try and clarify the issue. We have been running our u-boot for about 10 months with no issues. Are you suggesting that a bit has gone bad and because the older MLO did not set ecc correctly, we are now seeing this strang behavi... Anonymous

JC 04:56 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

Those ecc errors are coming from reading the environment from nand. If I remember correctly the older u-boot saved the environment using a 1 bit ecc (hamming) instead of 8 bit ecc (bch-8) which the new u-boot uses for everything. You ca... Jonathan Cormier

JC 04:49 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

No nevermind, thats not correct. You do have a 256MB nand module. So the first u-boot should be correct. Jonathan Cormier

JC 04:47 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

U-Boot mainline:
origin/u-boot-2013.10: d35e05656457c2d3715de8c3eb7c777375c160ae
u-boot config: mityarm335x_4kpage_config Jonathan Cormier

JC 04:46 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

Woops hangon didn't notice that you had a 3352 module. They have a larger nand and require a special u-boot build. Jonathan Cormier

04:40 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

Hey Jonathan,
Something is very unhappy. Here is the boot:
CCCCCCCC
U-Boot SPL 2013.10-gd35e056 (Jun 03 2014 - 17:00:30)
MitySOM335x profile 1 - Model No: 3352-GX-X27-RC Serial No: 134253
Configuring for 256 MB DDR3 @ 400MHz
C... Anonymous

JC 04:28 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

There was a bug with the older u-boot where ecc was not enabled when the UBL loaded the u-boot image. This meant that bitflips could cause weird error messages. Seeing as you don't have any problems when the u-boot is loaded from mmc, ... Jonathan Cormier

04:22 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

Here is the boot sequence:
----------------------------------------------------------------
U-Boot# CCCCCCCC
U-Boot SPL 21401-101.01.00.02-dirty (Nov 06 2013 - 08:59:11)
Texas Instruments Revision detection unimplemented
MityARM335x... Anonymous

JC 04:14 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

John,
What version of U-boot are you using? If you can include the full bootlog that would be helpful. Jonathan Cormier

03:59 PM Software Development: RE: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

As added information, the mtest command works.
Commands that *do* work:
mtest 402fffe0 402ffffe A5A500FF
mtest 80000000 8d000000 A5A500FF
Commands that *don't* work:
mw.b 8d000000 A
mw.b 402fffe0 A
mw.w 402fffe0 A
mw.l 402fff... Anonymous

03:24 PM Software Development: MityARM335x profile 1 - Model No: 3352-GX-X27-RC failing memory writes in u-boot

We just received one of our units back from the field and it hangs running a "mw.b" command in the u-boot param script. The system will lock up using DDR or internal ARM memory addresses in the mw.b command. If we boot off the mmc sd car... Anonymous