The 4a patch is made to show how can you define chips with access via Extebded Address Register. This patch is fully working but not required.
Patched files ------------- flashchips.c + modified definition of Winbond W25Q256BV/W25Q256FV chips
Signed-off-by: Boris Baykov dev@borisbaykov.com, Russia, Jan 2014 --- diff -U 5 -N ./flashrom/flashchips.c ./flashrom-1868-4ba-4a/flashchips.c --- ./flashrom/flashchips.c 2015-01-11 02:03:38.000000000 +0300 +++ ./flashrom-1868-4ba-4a/flashchips.c 2015-01-10 19:23:32.000000000 +0300 @@ -13329,32 +13329,33 @@ .total_size = 32768, .page_size = 256, /* supports SFDP */ /* OTP: 1024B total, 256B reserved; read 0x48; write 0x42, erase 0x44, read ID 0x4B */ /* FOUR_BYTE_ADDR: supports 4-bytes addressing mode */ - .feature_bits = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_SUPPORT, + .feature_bits = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_SUPPORT + | FEATURE_4BA_EXTENDED_ADDR_REG, .four_bytes_addr_funcs = { - .enter_4ba = spi_enter_4ba_b7_we, /* enter 4-bytes addressing mode by CMD B7 + WREN */ - .read_nbyte = spi_nbyte_read_4ba, /* read from 4-bytes addressing mode */ - .program_byte = spi_byte_program_4ba, /* write from 4-bytes addressing mode */ - .program_nbyte = spi_nbyte_program_4ba /* write from 4-bytes addressing mode */ + .enter_4ba = NULL, /* no need to enter 4-bytes addressing mode */ + .read_nbyte = spi_nbyte_read_4ba_ereg, /* read using ext.addr.reg from 3-bytes mode */ + .program_byte = spi_byte_program_4ba_ereg, /* write using ext.addr.reg from 3-bytes mode */ + .program_nbyte = spi_nbyte_program_4ba_ereg /* write using ext.addr.reg from 3-bytes mode */ }, .tested = TEST_OK_PREW, .probe = probe_spi_rdid, .probe_timing = TIMING_ZERO, .block_erasers = { { .eraseblocks = { {4 * 1024, 8192} }, - .block_erase = spi_block_erase_20_4ba, /* erases 4k from 4-bytes addressing mode */ + .block_erase = spi_block_erase_20_4ba_ereg, /* erases 4k using ext.addr.reg from 3-bytes mode */ }, { .eraseblocks = { {32 * 1024, 1024} }, - .block_erase = spi_block_erase_52_4ba, /* erases 32k from 4-bytes addressing mode */ + .block_erase = spi_block_erase_52_4ba_ereg, /* erases 32k using ext.addr.reg from 3-bytes mode */ }, { .eraseblocks = { {64 * 1024, 512} }, - .block_erase = spi_block_erase_d8_4ba, /* erases 64k from 4-bytes addressing mode */ + .block_erase = spi_block_erase_d8_4ba_ereg, /* erases 64k using ext.addr.reg from 3-bytes mode */ }, { .eraseblocks = { {32 * 1024 * 1024, 1} }, .block_erase = spi_block_erase_60, }, { .eraseblocks = { {32 * 1024 * 1024, 1} },