The driver appears to work reliably (i.e. lockup-free) with a card based
on this chip. However, I have not explored whether we could get anything
in terms of 3D performance "for free" just by setting some magic bits
in those registers that are still a mystery to us.
#define PCI_CHIP_R300_NF 0x4E46
#define PCI_CHIP_R300_NG 0x4E47
#define PCI_CHIP_R350_NH 0x4E48
+#define PCI_CHIP_R420_JI 0x4A49
#define PCI_CHIP_R420_JK 0x4a4b
#endif
screen->chipset = RADEON_CHIP_R300;
break;
+ case PCI_CHIP_R420_JI:
case PCI_CHIP_R420_JK:
screen->chipset = RADEON_CHIP_R420;
break;