U-Boot: AM335x Booting with environment in NAND: ECC cause failures...

Trying to boot from NAND on an AM335x-EVM with environment in NAND

Have cloned "git://arago-project.org/git/projects/u-boot-am33x.git" and done some minor changes (see below)

All documentation I've read tell me to use "nandecc hw 2" before programming the NAND.

If I program the kernel and rootfs into the nand by

nandecc hw 2
nand.write ...

and then save the environment, it looks like the environment is saved with the same ECC algorithm.

This is no good, since U-Boot will always read the environment at boot, using the incompatible Hamming Mode, so the next reboot will fail.

This looks like a bug to me.

Methinks there should be a configuration item telling which ECC algorithm to use for the environment, and this is used when reading the environment at boot,
and when using "saveenv".

Any other read/writes should use the user defined algorithm

Right now, you need to remember to set the ECC to Hamming before every saveenv

BR
Ulf Samuelsson

-----------------------------------------------------------------

index 55af69f..ec5480c 100644
@@ -168,10 +168,11 @@ omap3_pandora                arm armv7       

pandora -
igep0020 arm armv7 igep0020
isee omap3
igep0030 arm armv7 igep0030
isee omap3
am335x_evm arm armv7 am335x
ti ti81xx
-am335x_evm_restore_flash arm armv7 am335x
ti ti81xx am335x_evm:RESTORE_FLASH
-am335x_evm_spiboot arm armv7 am335x
ti ti81xx am335x_evm:SPI_BOOT
-am335x_evm_uart_usbspl arm armv7 am335x
ti ti81xx am335x_evm:UART_THEN_USB_SPL
-am335x_evm_restore_flash_usbspl arm armv7 am335x
ti ti81xx am335x_evm:RESTORE_FLASH,UART_THEN_USB_SPL
+am335x_evm_nandflash arm armv7 am335x
ti ti81xx am335x_evm:NAND_BOOT
+am335x_evm_restore_flash arm armv7 am335x
ti ti81xx am335x_evm:RESTORE_FLASH
+am335x_evm_spiboot arm armv7 am335x
ti ti81xx am335x_evm:SPI_BOOT
+am335x_evm_uart_usbspl arm armv7 am335x
ti ti81xx am335x_evm:UART_THEN_USB_SPL
+am335x_evm_restore_flash_usbspl arm armv7 am335x
ti ti81xx am335x_evm:RESTORE_FLASH,UART_THEN_USB_SPL
am3517_crane arm armv7 am3517crane
ti omap3
am3517_evm arm armv7 am3517evm
logicpd omap3
am3517_evm_norflash arm armv7 am3517evm
logicpd omap3 am3517_evm:SYS_HAS_NORFLASH

This is not the right list for that tree.

[snip]

Yes. The series that adds NAND support for this SoC to mainline fixes the problem as well (a faulty nand read in the SPL case).

Tom
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