First attempt at shedding some light on the MCP67 SPI situation. Huge thanks to Michael Karcher for reverse engineering the chipset and writing a spec. Due to this, we were able to use the chinese wall technique for 100% clean room reverse engineering.
This patch doesn't touch any of the new registers, it only reads them. Assuming that read has no side effects, this patch is a no-op and safe. We need "flashrom -V" output from MCP67 boards with SPI flash and from boards with LPC flash. Note: That output is only helpful if it is created with patched flashrom and if is from the first run of flashrom after a cold boot (reset or Ctrl-Alt-Del is not sufficient). I hope to see a pattern based on which we can detect which flash type is present on the board. Alex, we need this output (as described above) from your Asus M2N68-VM board. I'd like to merge this ASAP and then ping everyone who had this chipset to get flashrom -V output. Signed-off-by: Carl-Daniel Hailfinger <[email protected]> Index: flashrom-mcp67_spi_detect/chipset_enable.c =================================================================== --- flashrom-mcp67_spi_detect/chipset_enable.c (Revision 792) +++ flashrom-mcp67_spi_detect/chipset_enable.c (Arbeitskopie) @@ -1020,6 +1020,76 @@ return 0; } +/** + * The MCP67 code is guesswork based on cleanroom reverse engineering. + * Due to that, it only reads info and doesn't change any settings. + * It is assumed that LPC chips need the MCP55 code and SPI chips need the + * code provided in this function. Until we know for sure, call + * enable_flash_mcp55 from this function. + */ +static int enable_flash_mcp67(struct pci_dev *dev, const char *name) +{ + int result = 0; + uint8_t byte; + uint16_t status; + uint32_t gpiobaraddr; + void *gpiobar; + struct pci_dev *smbusdev; + + /* dev is the ISA bridge. No idea what the stuff below does. */ + byte = pci_read_byte(dev, 0x8a); + printf_debug("ISA bridge reg 0x8a contents: 0x%02x, bit 6 is %i, bit 5" + " is %i\n", byte, (byte >> 6) & 0x1, (byte >> 5) & 0x1); + /* Disable the write code for now until we have more info. */ +#if 0 + byte |= (1 << 6); + byte &= ~(1 << 5); + pci_write_byte(dev, 0x8a, byte); +#endif + + /* Look for the SMBus device. Should we look for the SMBus PCI class? */ + smbusdev = pci_dev_find(0x10de, 0x0542); + if (!smbusdev) { + fprintf(stderr, "ERROR: SMBus device not found. Aborting.\n"); + exit(1); + } + + /* Locate the BAR where the GPIOs live. */ + gpiobaraddr = pci_read_long(smbusdev, 0x74); + printf_debug("GPIO BAR is at 0x%08x, ", gpiobaraddr); + /* We hope this has native alignment. We know the GPIOs are at offset + * 0x530, so we expect a size of at least 0x800. Clear the lower bits. + * It is entirely possible that the BAR is 64k big and the low bits are + * reserved for an entirely different purpose. + */ + gpiobaraddr &= ~0x7ff; + printf_debug("after clearing low bits BAR is at 0x%08x\n", gpiobaraddr); + + /* Accessing a NULL pointer BAR is evil. Don't do it. */ + if (gpiobaraddr) { + /* Map the BAR. We access bytewise and wordwise at 0x530. */ + gpiobar = physmap("MCP67 GPIO", gpiobaraddr, 0x534); +/* Guessed. If this is correct, migrate to a separate MCP67 SPI driver. */ +#define MCP67_SPI_CS (1 << 1) +#define MCP67_SPI_SCK (1 << 2) +#define MCP67_SPI_MOSI (1 << 3) +#define MCP67_SPI_MISO (1 << 4) +#define MCP67_SPI_ENABLE (1 << 0) +#define MCP67_SPI_IDLE (1 << 8) + status = mmio_readw(gpiobar + 0x530); + printf_debug("SPI control is 0x%04x, enable=%i, idle=%i\n", + status, status & 0x1, (status >> 8) & 0x1); + printf("Please send the output of \"flashrom -V\" to " + "[email protected] to help us improve MCP67 chipset" + " support. Thanks.\n"); + } + + /* Not sure if this is still correct. No docs as usual. */ + result = enable_flash_mcp55(dev, name); + + return result; +} + static int enable_flash_ht1000(struct pci_dev *dev, const char *name) { uint8_t byte; @@ -1157,7 +1227,7 @@ {0x10de, 0x0365, OK, "NVIDIA", "MCP55", enable_flash_mcp55}, /* LPC */ {0x10de, 0x0366, OK, "NVIDIA", "MCP55", enable_flash_mcp55}, /* LPC */ {0x10de, 0x0367, OK, "NVIDIA", "MCP55", enable_flash_mcp55}, /* Pro */ - {0x10de, 0x0548, OK, "NVIDIA", "MCP67", enable_flash_mcp55}, + {0x10de, 0x0548, OK, "NVIDIA", "MCP67", enable_flash_mcp67}, {0x1039, 0x0496, NT, "SiS", "85C496+497", enable_flash_sis85c496}, {0x1039, 0x0406, NT, "SiS", "501/5101/5501", enable_flash_sis501}, {0x1039, 0x5511, NT, "SiS", "5511", enable_flash_sis5511}, -- Developer quote of the month: "We are juggling too many chainsaws and flaming arrows and tigers." _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
