[coreboot] M2v-mx_se asus : nvram reset on power unplug
Rudolf Marek
r.marek at assembler.cz
Mon Feb 8 18:01:51 CET 2010
hi
This NVRAM is for suspend/resume. So it is only powered if 5VSB is
there. So it is not a real battery backup device.
The platform has 256 bytes of classic NVRAM (CMOS). I think you can use
ioports 74/75. to get access
to whole 256Bytes.
(check if PCI 11.0 4e bit 3 is 1) I think it should be.
Rudolf
congedete at voila.fr wrote:
> I use those methods in Seabios.
> And as soon as I unplug the power supply, load_state_from_nvram doesn't return the value saved.
> Is something wrong with my methods ?
>
> #define K8T890_NVRAM_IO_BASE 0xf00
> int save_state_to_nvram(u32 dword) {
> int nvram_pos=64;
> dprintf(1,"Writing %x of size 4 to nvram pos: %d\n", dword, nvram_pos);
> //size=4
> outl(dword, K8T890_NVRAM_IO_BASE+nvram_pos);
> nvram_pos +=4;
>
> return nvram_pos;
> }
>
> int load_state_from_nvram( u32 *old_dword) {
> int nvram_pos=64;
> //size=4
> *old_dword = inl(K8T890_NVRAM_IO_BASE+nvram_pos);
> nvram_pos +=4;
>
> dprintf(1,"Loading %x of size 4 from nvram pos:%d\n", * old_dword, nvram_pos-4);
> return nvram_pos;
> }
>
>
>
>> Message du 05/02/10 à 20h38
>> De : "Joseph Smith" <joe at settoplinux.org>
>> A : congedete at voila.fr
>> Copie à : coreboot at coreboot.org
>> Objet : Re: [coreboot] M2v-mx_se asus : nvram reset on power unplug
>>
>> On 02/05/2010 02:35 PM, congedete at voila.fr wrote:
>>
>>>
>>>
>>>> Message du 05/02/10 à 19h52
>>>> De : "Joseph Smith"<joe at settoplinux.org>
>>>> A : congedete at voila.fr
>>>> Copie à : coreboot at coreboot.org
>>>> Objet : Re: [coreboot] M2v-mx_se asus : nvram reset on power unplug
>>>>
>>>>
>>>> On 02/05/2010 01:22 PM, congedete at voila.fr wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> When I shutdown my computer, my nvram datas are kept alive. But if I unplug/plug the power supply, nvram is reset.
>>>>> The clock is OK, so it is not a battery problem.
>>>>>
>>>>> How can I keep datas in nvram when I unplug the power supply ?
>>>>>
>>>>>
>>>> Either your CMOS battery is dead or you have RTC issue.
>>>>
>>> But the clock is OK, so I don't think my CMOS battery is dead.
>>> Could you tell me more about the RTC issue ?
>>>
>>>
>> Is this with coreboot?
>>
>>
>> --
>> Thanks,
>> Joseph Smith
>> Set-Top-Linux
>> www.settoplinux.org
>>
>> --
>> coreboot mailing list: coreboot at coreboot.org
>> http://www.coreboot.org/mailman/listinfo/coreboot
>>
>
> ____________________________________________________
>
> Faites le plein d’amour, de cadeaux coquins et de poèmes romantiques avec Voila sur http://evenementiel.voila.fr/SaintValentin2010/
>
>
>
>
>
>
More information about the coreboot
mailing list