Re: Intel 82801H SATA interrupt issues

On Wed, Sep 04, 2024 at 06:17:31AM +0000, Emmanuel Dreyfus wrote:
> I gave it a try by patching ahci match routine, but got no success so far.

In ahci_pci_match I tried this:

	pcireg_t v;
	const int ich89_address_map_reg = 0x90;

	v = pci_conf_read(pa->pa_pc, pa->pa_tag, ich89_address_map_reg);
	printf("armval = 0x%08x\n", v);

	v |= 0x40;
	v &= ~0x80;
	printf("write back armval = 0x%08x\n", v);
	pci_conf_write(pa->pa_pc, pa->pa_tag, ich89_address_map_reg, v);

	v = pci_conf_read(pa->pa_pc, pa->pa_tag, ich89_address_map_reg);
	printf("updated armval = 0x%08x\n", v);

Result:
[   1.0041382] armval = 0x01030000
[   1.0041382] write back armval = 0x01030040
[   1.0041382] updated armval = 0x01030000

Is there something I am doing obviously wrong? I note the documentation
says only the BIOS should do this, but how is this different from the 
BIOS doing it? The controller is not yet in operation.




-- 
Emmanuel Dreyfus
[email protected]