On Wed, Oct 26, 2022 at 9:46 PM Philippe Mathieu-Daudé <phi...@linaro.org> wrote:
> IRQRC[A:D] registers reset value is 0x80. We were forcing > the MIPS Malta machine routing to be able to boot a Linux > kernel without any bootloader. > We now have these registers initialized in the Malta machine > write_bootloader(), so we can use the correct reset values. > > Signed-off-by: Philippe Mathieu-Daudé <phi...@linaro.org> > --- > hw/isa/piix4.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c > index 15f344dbb7..a2165c6a49 100644 > --- a/hw/isa/piix4.c > +++ b/hw/isa/piix4.c > @@ -115,10 +115,10 @@ static void piix4_isa_reset(DeviceState *dev) > pci_conf[0x4c] = 0x4d; > pci_conf[0x4e] = 0x03; > pci_conf[0x4f] = 0x00; > - pci_conf[0x60] = 0x0a; // PCI A -> IRQ 10 > - pci_conf[0x61] = 0x0a; // PCI B -> IRQ 10 > - pci_conf[0x62] = 0x0b; // PCI C -> IRQ 11 > - pci_conf[0x63] = 0x0b; // PCI D -> IRQ 11 > + pci_conf[0x60] = 0x80; > + pci_conf[0x61] = 0x80; > + pci_conf[0x62] = 0x80; > + pci_conf[0x63] = 0x80; > Running `qemu-system-mips64el -M malta -kernel vmlinux-3.2.0-4-5kc-malta -hda debian_wheezy_mipsel_standard.qcow2 -append "root=/dev/sda1 console=ttyS0"` with this patch Linux outputs: [ 7.944000] uhci_hcd: USB Universal Host Controller Interface driver [ 7.944000] uhci_hcd 0000:00:0a.2: Found HC with no IRQ. Check BIOS/PCI 0000:00:0a.2 setup! [ 7.944000] uhci_hcd 0000:00:0a.2: init 0000:00:0a.2 fail, -19 Omitting this patch from the series the USB host is found. Best regards, Bernhard > pci_conf[0x69] = 0x02; > pci_conf[0x70] = 0x80; > pci_conf[0x76] = 0x0c; > -- > 2.37.3 > >
