[Arm-netbook] Mele A1000 defective memory and related

[cnxsoft]

On 26/06/2012 04:58, Henrik Nordström wrote:
> mån 2012-06-25 klockan 22:48 +0200 skrev Valery Yundin:
>
>> I wonder if anyone had similar problems. Also I've spotted a few DRAM
>> related options in script.fex[bin], does anybody know what they mean? Can I
>> reduce ram clocking or increase latencies to make it more stable? Is there
>> any chance it would it help or it is just defective chip?
> If using the allwinner bootloaders (boot0/boot1/boot.axf) then yes.
>
> With u-boot-mmc all memory parameters is currently hardcoded however and
> script.bin is ignored. Working on fixing that..
>
>> Another related question. Why we use only the first 448M out of 512?
>> Is it reserved for GPU? Would it be possible to utilize it if I'm running
>> a headless box and do not need graphics?
> There is reserved areas for
>
>    MALI
>    Framebuffer
>    VPU
>    G2D
>    GPS
>
> But all can be reclaimed.
>
> All except the MALI reservation can be reclaimed by disabling their
> support in the kernel config. Reclaiming the MALI reservation requires
> removing the DRAM mapping hack currently in place in the kernel source.
>
> Regards
> Henrik
Somebody told me he could get the full memory, by adding mem=512M at 0×40000000

"Yes, I did it in kernel config, since I don’t know how to change 
cmdline in bootloader.

CONFIG_CMDLINE=”mem=512M at 0×40000000″
# CONFIG_CMDLINE_FROM_BOOTLOADER is not set
CONFIG_CMDLINE_EXTEND=y

AFAIK the upper 64M are reserved for MALI GPU, if it is disabled there 
should be no problem in using them. Still have to test it more extensively"

I can't add that to the Wiki because I get a nasty "504 Gateway 
Time-out" when editing it.