--- Sergey Kononenko <sergk@xxxxxxxxxxxx> wrote:
> Hello,
>
> The aic94xx driver in current mainline kernel don't work with
> controllers integrated in some of Supermicro motherboards (i have
> tested only on X6DHR-3G2) due to two reasons:
> - driver do not contain corresponding PCI id (9005:041F)
> - driver can not find flash on controller.
>
> Patches which i send now ordered to resolve this problems.
>
> First one is a simple and just add pci id, but second one is a bit
> controversial.
>
> The following code from function asd_flash_getid (aic94xx_sds.c)
>
> reg = asd_read_reg_dword(asd_ha, EXSICNFGR);
>
> if (!(reg & FLASHEX)) {
> ASD_DPRINTK("flash doesn't exist\n");
> return -ENOENT;
> }
>
> failed with error on controllers in supermicro motherboards.
> Looks like flag FLASHEX did not set on such devices, however flash chip
> present and without above if statement in code drivers works normally
> on supermicro controllers.
>
> As i found this code was commented out in original driver by Luben
> Tuikov with following comment:
>
> /* Early (current?) SuperMicro mainboards, X6DHR-3G2 and X6DH3-G2
> have a bug whereby RS104 is missing (not installed) and RS103
> is installed, causing FLASHEX to be 0. */
> /* if (!(reg & FLASHEX)) { */
> /* ASD_DPRINTK("flash doesn't exist\n"); */
> /* return -ENOENT; */
> /* } */
>
> May be it is possible to write separate code for checking
> availability of flash chip especially for supermicro
> motherboards, but i don't know hot it possible and don't know what is
> RS104, RS103 and difference between it.
RSxyz stands for "resistor xyz" in the schematic diagrams.
This is a hardware bug in the (early?) SuperMicro mainboards.
It dates from last year, 20 October 2005.
This is the commit from my git tree:
commit 433484ee805a953793cc33efa890cb24ef4afe1a
Author: Luben Tuikov <luben_tuikov@xxxxxxxxxxx>
Date: Thu Oct 20 18:11:30 2005 -0400
Fix around buggy mainboards reporting Flash memory present
Early (current?) SuperMicro mainboards, X6DHR-3G2 and X6DH3-G2
have a bug whereby RS104 is missing (not installed) and RS103
is installed, causing FLASHEX to be 0.
Signed-off-by: Luben Tuikov <luben_tuikov@xxxxxxxxxxx>
> But more likely that check of FLASHEX can be removed safely from code
Yes, you can remove it safely.
Luben
> because below there is another more generic check for flash chip via
> pci config probe.
>
> This solution works perfect in my case, also it was in original code,
> however i think this second patch would be tested on some other
> varieties of aic94xx hardware.
>
> --
> Sergey Kononenko
> -
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