diff options
| -rw-r--r-- | sb600spi.c | 18 |
1 files changed, 18 insertions, 0 deletions
@@ -294,6 +294,24 @@ int sb600_probe_spi(struct pci_dev *dev) return 0; } + reg = pci_read_byte(dev, 0x40); + msg_pdbg("SB700 IMC is %sactive.\n", (reg & (1 << 7)) ? "" : "not "); + if (reg & (1 << 7)) { + /* If we touch any region used by the IMC, the IMC and the SPI + * interface will lock up, and the only way to recover is a + * hard reset, but that is a bad choice for a half-erased or + * half-written flash chip. + * There appears to be an undocumented register which can freeze + * or disable the IMC, but for now we want to play it safe. + */ + msg_perr("The SB700 IMC is active and may interfere with SPI " + "commands. Disabling write.\n"); + /* FIXME: Should we only disable SPI writes, or will the lockup + * affect LPC/FWH chips as well? + */ + programmer_may_write = 0; + } + /* Bring the FIFO to a clean state. */ reset_internal_fifo_pointer(); |