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) */