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[XBOX][FREELDR] Initialize PCI-AGP bridge BAR values

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This fixes problem with Xbox GPU not being detected as a children device.

CORE-17600 CORE-16216
This commit is contained in:
Stanislav Motylkov 2021-05-25 20:32:42 +03:00
parent 13073e1acb
commit 6d441f7d65
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1 changed files with 25 additions and 0 deletions
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25
boot/freeldr/freeldr/arch/i386/xbox/xboxmem.c
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@ -86,6 +86,31 @@ XboxInitializePCI(VOID)
PciData |= 0x00020200;
WRITE_PORT_ULONG((PULONG)PCI_TYPE1_DATA_PORT, PciData);
}
/* Select AGP to PCI bridge */
PciCfg1.u.bits.DeviceNumber = 30;
/* Select register VendorID & DeviceID */
PciCfg1.u.bits.RegisterNumber = 0x00;
WRITE_PORT_ULONG(PCI_TYPE1_ADDRESS_PORT, PciCfg1.u.AsULONG);
PciData = READ_PORT_ULONG((PULONG)PCI_TYPE1_DATA_PORT);
if (PciData == 0x01B710DE)
{
/* Zero out uninitialized AGP Host bridge BARs */
/* Select register BAR0 */
PciCfg1.u.bits.RegisterNumber = 0x10;
WRITE_PORT_ULONG(PCI_TYPE1_ADDRESS_PORT, PciCfg1.u.AsULONG);
/* Zero it out */
WRITE_PORT_ULONG((PULONG)PCI_TYPE1_DATA_PORT, 0);
/* Select register BAR1 */
PciCfg1.u.bits.RegisterNumber = 0x14;
WRITE_PORT_ULONG(PCI_TYPE1_ADDRESS_PORT, PciCfg1.u.AsULONG);
/* Zero it out */
WRITE_PORT_ULONG((PULONG)PCI_TYPE1_DATA_PORT, 0);
}
}
VOID