This is just a copy of the W25Q128 with the sizes all cut in half and a different chip ID.
It works fine for me.
--- ./flashchips.c 2018-11-01 09:37:32.000000000 -0700 +++ ../flashrom-v1.1/flashchips.c 2019-08-07 18:48:54.000000000 -0700 @@ -15671,6 +15671,42 @@
{ .vendor = "Winbond", + .name = "W25Q64.V.M", + .bustype = BUS_SPI, + .manufacture_id = WINBOND_NEX_ID, + .model_id = WINBOND_NEX_W25Q64_V_M, + .total_size = 8192, + .page_size = 256, + .feature_bits = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_QPI, + .tested = TEST_OK_PREW, + .probe = probe_spi_rdid, + .probe_timing = TIMING_ZERO, + .block_erasers = + { + { + .eraseblocks = { {2 * 1024, 4096} }, + .block_erase = spi_block_erase_20, + }, { + .eraseblocks = { {16 * 1024, 512} }, + .block_erase = spi_block_erase_52, + }, { + .eraseblocks = { {32 * 1024, 256} }, + .block_erase = spi_block_erase_d8, + }, { + .eraseblocks = { {8 * 1024 * 1024, 1} }, + .block_erase = spi_block_erase_60, + }, { + .eraseblocks = { {8 * 1024 * 1024, 1} }, + .block_erase = spi_block_erase_c7, + } + }, + .unlock = spi_disable_blockprotect, + .write = spi_chip_write_256, + .read = spi_chip_read, + .voltage = {2700, 3600}, + }, + { + .vendor = "Winbond", .name = "W25Q128.V..M", .bustype = BUS_SPI, .manufacture_id = WINBOND_NEX_ID, --- ./flashchips.h 2018-11-01 09:37:32.000000000 -0700 +++ ../flashrom-v1.1/flashchips.h 2019-08-07 18:48:54.000000000 -0700 @@ -931,6 +931,7 @@ #define WINBOND_NEX_W25Q32_W 0x6016 /* W25Q32DW; W25Q32FV in QPI mode */ #define WINBOND_NEX_W25Q64_W 0x6017 /* W25Q64DW; W25Q64FV in QPI mode */ #define WINBOND_NEX_W25Q128_W 0x6018 /* W25Q128FW; W25Q128FV in QPI mode */ +#define WINBOND_NEX_W25Q64_V_M 0x7017 /* W25Q64JVSM */ #define WINBOND_NEX_W25Q128_V_M 0x7018 /* W25Q128JVSM */ #define WINBOND_NEX_W25Q256JV_M 0x7019 /* W25Q256JV_M (QE=0) */