[U-Boot] Using Micron (Numonyx) m28w640hcb with u-boot

[Vipin Kumar]

On 11/14/2011 9:59 PM, Gudjon I. Gudjonsson wrote:
> Hi Vipin
>>

Hello Gudjon,

>> I have had a similar problem with spear3xx board. Basically, this flash
>> is write protected in hardware by default. It has to be specifically
>> made writable. Please define a flag CONFIG_SYS_FLASH_PROTECTION in your
>> config file.
>>
> Thanks a lot. This works like charm :)
>
> Now I have spent the whole day on trying to mount the device from Linux as a
> read/write partition but without luck.
>

Ideally, it should have happened now

> I can mount the partition but if I try to do some writing to it I get:
>
> Write clean marker to block at 0x00030000 failed: -30
> ...
> repeated for all sector boundaries. If I reboot the device the partition is
> empty.
>
>
> Then I tried to use flash_eraseall but it fails as well
> # flash_eraseall -j /dev/mtd1
> Erasing 64 Kibyte @ 0 --  0 % complete.
> flash_eraseall: /dev/mtd1: MTD write failure: Read-only file system
>
> I tried to unlock the flash (using protect off) before booting Linux but
> without any success.
>

There is one environment variable to do it. setenv unlock yes
I think this should be sufficient

> I can't find any configuration option related to the NOR CFI flash in the
> spear3xx kernel configuration files.
> Do you have any useful hint on this as well?
>

Sorry, I dont have any other idea specifically for this.
I will let you know if something comes to mind

Vipin

> Regards
> Gudjon
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