diff options
Diffstat (limited to 'util/flashrom/flash_enable.c')
| -rw-r--r-- | util/flashrom/flash_enable.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/util/flashrom/flash_enable.c b/util/flashrom/flash_enable.c index 6c894e7260..187b61d88e 100644 --- a/util/flashrom/flash_enable.c +++ b/util/flashrom/flash_enable.c @@ -77,6 +77,37 @@ static int enable_flash_sis630(struct pci_dev *dev, char *name) return 0; } +/* Datasheet: http://www.intel.com/design/intarch/datashts/290562.htm */ +static int enable_flash_piix4(struct pci_dev *dev, char *name) +{ + uint16_t old, new; + uint16_t xbcs = 0x4e; /* X-Bus Chip Select register. */ + + old = pci_read_word(dev, xbcs); + + /* Set bit 9: 1-Meg Extended BIOS Enable (PCI master accesses to + FFF00000-FFF7FFFF are forwarded to ISA). + Set bit 7: Extended BIOS Enable (PCI master accesses to + FFF80000-FFFDFFFF are forwarded to ISA). + Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to + the lower 64-Kbyte BIOS block (E00000EFFFF) at the top + of 1 Mbyte, or the aliases at the top of 4 Gbyte + (FFFE0000-FFFEFFF) result in the generation of BIOSCS#. + Set bit 2: BIOSCS# Write Protect Enable (1=enable, 0=disable). */ + new = old | 0x2c4; + + if (new == old) + return 0; + + pci_write_word(dev, xbcs, new); + + if (pci_read_word(dev, xbcs) != new) { + printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", xbcs, new, name); + return -1; + } + return 0; +} + static int enable_flash_ich(struct pci_dev *dev, char *name, int bios_cntl) { /* register 4e.b gets or'ed with one */ @@ -362,6 +393,7 @@ typedef struct penable { static FLASH_ENABLE enables[] = { {0x1039, 0x0630, "SIS630", enable_flash_sis630}, + {0x8086, 0x7110, "PIIX4/PIIX4E/PIIX4M", enable_flash_piix4}, {0x8086, 0x2410, "ICH", enable_flash_ich_4e}, {0x8086, 0x2420, "ICH0", enable_flash_ich_4e}, {0x8086, 0x2440, "ICH2", enable_flash_ich_4e}, |