[flashrom] Micron N25Q512, or at least its lower quarter

[David Madl]

Hi,

I have a new prototype development board here, with an 512 MBit Flash
chip, Micron N25Q512 (precise type is N25Q512A11G40). I managed to
create a config [1] that reads fine, but fails to write [2].

I understand that flashrom cannot access chips larger than 16 MBytes,
but the chip should still be able to work in 3-byte addressing mode for
the lower 16 MBytes. This is what I have created in flashchips.c (copy &
pasted, then adapted from the part N25Q128, assuming with a bit of good
faith and some datasheet comparison that they should behave alike).

Has anyone ever successfully written to a small part of a 4-byte flash chip?

Thanks,
David


=========================

[1] new stuff for flashchips.c

    {
        .vendor     = "Micron/Numonyx/ST",
        .name       = "N25Q512..3E", /* ..3E = 3V, uniform 64KB/4KB
blocks/sectors */
        .bustype    = BUS_SPI,
        .manufacture_id = ST_ID,
        .model_id   = ST_N25Q512__3E,
/*      .total_size = 65536,*/
        .total_size = 16384,
        .page_size  = 256,
        /* supports SFDP */
        /* OTP: 64B total; read 0x4B, write 0x42 */
        .feature_bits   = FEATURE_WRSR_WREN | FEATURE_OTP,
        .tested     = TEST_OK_PREW,
        .probe      = probe_spi_rdid,
        .probe_timing   = TIMING_ZERO,
        .block_erasers  = {
            {
                /*.eraseblocks = { {4 * 1024, 16384 } },*/
                .eraseblocks = { {4 * 1024, 4096 } },
                .block_erase = spi_block_erase_20,
            }, {
                /*.eraseblocks = { {64 * 1024, 1024} },*/
                .eraseblocks = { {64 * 1024, 256} },
                .block_erase = spi_block_erase_d8,
            }, {
                /*.eraseblocks = { {65536 * 1024, 1} },*/
                .eraseblocks = { {16384 * 1024, 1} },
                .block_erase = spi_block_erase_c7,
            }
        },
        .printlock  = spi_prettyprint_status_register_n25q, /* TODO:
config, lock, flag regs */
        .unlock     = spi_disable_blockprotect_n25q, /* TODO: per 64kB
sector lock registers */
        .write      = spi_chip_write_256, /* Multi I/O supported */
        .read       = spi_chip_read, /* Fast read (0x0B) and multi I/O
supported */
        .voltage    = {2700, 3600},
    },

=========================

[2] output from flashrom trying to write, and failing:

# /root/flashrom -p ft2232_spi:type=232H,divisor=8 -c 'N25Q512..3E' -V
-w flash.rom
flashrom v0.9.7-r1711 on Linux 3.13.6-1-ARCH (x86_64)
flashrom is free software, get the source code at http://www.flashrom.org

flashrom was built with libpci 3.2.1, GCC 4.8.2 20140206 (prerelease),
little endian
Command line (7 args): /root/flashrom -p ft2232_spi:type=232H,divisor=8
-c N25Q512..3E -V -w flash.rom
Calibrating delay loop... OS timer resolution is 1 usecs, 1588M loops
per second, 10 myus = 9 us, 100 myus = 117 us, 1000 myus = 1005 us,
10000 myus = 10324 us, 4 myus = 4 us, OK.
Initializing ft2232_spi programmer
Using device type FTDI FT232H channel A.
Disable divide-by-5 front stage
Set clock divisor
MPSSE clock: 60.000000 MHz, divisor: 8, SPI clock: 7.500000 MHz
No loopback of TDI/DO TDO/DI
Set data bits
The following protocols are supported: SPI.
Probing for Micron/Numonyx/ST N25Q512..3E, 16384 kB:
probe_spi_rdid_generic: id1 0x20, id2 0xba20
Found Micron/Numonyx/ST flash chip "N25Q512..3E" (16384 kB, SPI) on
ft2232_spi.
Chip status register is 0x00.
Chip status register: Status Register Write Disable (SRWD, SRP, ...) is
not set
Chip status register: Block Protect 3 (BP3) is not set
Chip status register: Top/Bottom (TB) is top
Chip status register: Block Protect 2 (BP2) is not set
Chip status register: Block Protect 1 (BP1) is not set
Chip status register: Block Protect 0 (BP0) is not set
Chip status register: Write Enable Latch (WEL) is not set
Chip status register: Write In Progress (WIP/BUSY) is not set
This chip may contain one-time programmable memory. flashrom cannot read
and may never be able to write it, hence it may not be able to completely
clone the contents of this chip (see man page for details).
Reading old flash chip contents...
done.
Erasing and writing flash chip... Trying erase function 0...
0x000000-0x000fff:W, 0x001000-0x001fff:E
FAILED at 0x00001000! Expected=0xff, Found=0x00, failed byte count from
0x00001000-0x00001fff: 0x1000
ERASE FAILED!
Reading current flash chip contents...
done. Looking for another erase function.
Trying erase function 1... 0x000000-0x00ffff:E
FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from
0x00000000-0x0000ffff: 0x10000
ERASE FAILED!
Reading current flash chip contents...
done. Looking for another erase function.
Trying erase function 2... 0x000000-0xffffff:E
FAILED at 0x00000000! Expected=0xff, Found=0x00, failed byte count from
0x00000000-0x00ffffff: 0x1000000
ERASE FAILED!
Looking for another erase function.
No usable erase functions left.
FAILED!
Uh oh. Erase/write failed. Checking if anything changed.
Your flash chip is in an unknown state.
Please report this on IRC at chat.freenode.net (channel #flashrom) or
mail flashrom at flashrom.org, thanks!