[U-Boot] [PATCH v2] arm : Atmel : add at91sam9x5ek board support

["Andreas Bießmann" <andreas.devel@googlemail.com>]

Dear all,

On 02.07.2012 11:53, Nicolas Ferre wrote:
> On 07/02/2012 11:47 AM, Andreas Bie?mann :
>> On 02.07.2012 10:36, Bo Shen wrote:
> 
> [..]
> 
>>>>> +/* bootstrap + u-boot + env + linux in nandflash */
>>>>> +#define CONFIG_ENV_IS_IN_NAND
>>>>> +#define CONFIG_ENV_OFFSET        0xc0000
>>>>> +#define CONFIG_ENV_OFFSET_REDUND    0x100000
>>>>> +#define CONFIG_ENV_SIZE        0x20000        /* 1 sector = 128 kB */
>>>>> +#define CONFIG_BOOTCOMMAND    "nand read.jffs2 " \
>>>>> +                "0x22000000 0x200000 0x300000; " \
>>>>> +                "bootm 0x22000000"
>>>>
>>>> Well, you read from jffs but work with ubifs later on? Is that ok?
>>>> BTW: I do not know 'nand read.jffs2', does this subcommand exist really?
>>>
>>> Using the read with subfix .jffs2 it to skip the bad block. This
>>> partition is for Linux kernel.
>>> I will remove the .jffs2 to avoid confusing.
>>
>> Well, it is ok with me to use read.jffs2 (if it works). I just do not
>> know about that subcommand and I can only find some references about
>> that in two other boards. I guess these boards are just forgotten while
>> removing the 'nand read.jffs2' command. Please check, if that command
>> works, if yes let it as is, if not rewrite.
> 
> I am in favor of using read.jffs2 because it is able to skip bad blocks.
> As the programming tool is also skipping bad blocks the same way, we
> have a configuration that is perfectly working even in case of bad block
> in the middle of the kernel image.
> 
> So please, keep using read.jffs2 (or equivalent)!

I have the same opinion here, we should skip bad blocks. But I think
'nand read.jffs2' is not available any longer.

from current common/cmd_nand.c:
---8<---
	"nand read - addr off|partition size\n"
	"nand write - addr off|partition size\n"
	"    read/write 'size' bytes starting@offset 'off'\n"
	"    to/from memory address 'addr', skipping bad blocks.\n"
	"nand read.raw - addr off|partition [count]\n"
	"nand write.raw - addr off|partition [count]\n"
	"    Use read.raw/write.raw to avoid ECC and access the flash as-is.\n"
--->8---

Best regards

Andreas Bie?mann