Re: 10.0 DMA Issues With SIS-5597/5598 Chipset

[Alexander Jacocks <jjacocks%mac.com@localhost>]

> On Jun 13, 2024, at 5:51 AM, Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> 
> On Wed, Jun 12, 2024 at 10:29:59AM -0400, Alexander Jacocks wrote:
>>   And it was pointed out to me that my paste of the DMA error was incorrect.
>>   Here is the correct log:
>>   [     1.000004] pci0 at mainbus0 bus 0: configuration mode 1
>>   [     1.000004] pci0: i/o space, memory space enabled, rd/line, rd/mult,
>>   wr/inv ok
>>   [     1.000004] pchb0 at pci0 dev 0 function 0: Silicon Integrated System
>>   5597/5598 Host Bridge (rev. 0x10)
>>   [     1.000004] pcib0 at pci0 dev 1 function 0: Silicon Integrated System
>>   85C503 or 5597/5598 ISA Bridge (rev. 0x01)
>>   [     1.000004] siside0 at pci0 dev 1 function 1
>>   [     1.000004] siside0: Silicon Integrated Systems 5597/5598 IDE
>>   controller (rev. 0xd0)
>>   [     1.000004] siside0: bus-master DMA support present, but unused
>>   (couldn't map registers)
> 
> The problem here is that the DMA registers are not mappable, so can't be
> used by the driver. Some BIOS settings (like PnP support) may affect this.
> 
>>   [     1.000004] siside0: secondary channel ignored (disabled)
>>   I tried simply forcing DMA on by adding the 0x0001 flag to the pciide
>>   driver, with a minor mod to the GENERIC kernel, but it didn't change the
>>   behavior any. I also attempted to add in a Maxtor SATA-150 PCI IDE
> 
> Yes, that won't work in this case.

Interesting. I was able to verify that Windows 98SE is able to enable DMA support, even with the current BIOS settings. This BIOS is pretty limited in what can be configured, unfortunately.

Would disabling ACPI and enabling APM possibly help? Since this board clearly has a broken ACPI configuration, that seems like a possibility.

Thanks!
- Alex