diff options
Diffstat (limited to 'jedec.c')
| -rw-r--r-- | jedec.c | 49 |
1 files changed, 49 insertions, 0 deletions
@@ -121,6 +121,55 @@ static void start_program_jedec_common(const struct flashctx *flash, unsigned in chip_writeb(flash, 0xA0, bios + (0x5555 & mask)); } +int probe_jedec_29gl(struct flashctx *flash) +{ + unsigned int mask = getaddrmask(flash->chip); + chipaddr bios = flash->virtual_memory; + const struct flashchip *chip = flash->chip; + + /* Reset chip to a clean slate */ + chip_writeb(flash, 0xF0, bios + (0x5555 & mask)); + + /* Issue JEDEC Product ID Entry command */ + chip_writeb(flash, 0xAA, bios + (0x5555 & mask)); + chip_writeb(flash, 0x55, bios + (0x2AAA & mask)); + chip_writeb(flash, 0x90, bios + (0x5555 & mask)); + + /* Read product ID */ + // FIXME: Continuation loop, second byte is at word 0x100/byte 0x200 + uint32_t man_id = chip_readb(flash, bios + 0x00); + uint32_t dev_id = (chip_readb(flash, bios + 0x01) << 16) | + (chip_readb(flash, bios + 0x0E) << 8) | + (chip_readb(flash, bios + 0x0F) << 0); + + /* Issue JEDEC Product ID Exit command */ + chip_writeb(flash, 0xF0, bios + (0x5555 & mask)); + + msg_cdbg("%s: man_id 0x%02x, dev_id 0x%06x", __func__, man_id, dev_id); + if (!oddparity(man_id)) + msg_cdbg(", man_id parity violation"); + + /* Read the product ID location again. We should now see normal flash contents. */ + uint32_t flashcontent1 = chip_readb(flash, bios + 0x00); // FIXME: Continuation loop + uint32_t flashcontent2 = (chip_readb(flash, bios + 0x01) << 16) | + (chip_readb(flash, bios + 0x0E) << 8) | + (chip_readb(flash, bios + 0x0F) << 0); + + if (man_id == flashcontent1) + msg_cdbg(", man_id seems to be normal flash content"); + if (dev_id == flashcontent2) + msg_cdbg(", dev_id seems to be normal flash content"); + + msg_cdbg("\n"); + if (man_id != chip->manufacture_id || dev_id != chip->model_id) + return 0; + + if (chip->feature_bits & FEATURE_REGISTERMAP) + map_flash_registers(flash); + + return 1; +} + static int probe_jedec_common(struct flashctx *flash, unsigned int mask) { chipaddr bios = flash->virtual_memory; |
