This patch provides a support to read a flash using 'dofr' read instruction(rd_inst) for 'sf read' and 'sf update' commands.
'dofr' will effectively increases the data transfer rate by up to two times, as compared to the afr(Array Fast Read).
Example: read 0x2000 length bytes starting at offset 0x0 to memory at 0x10000 using dofr read instruction. u-boot> sf read dofr 0x10000 0x0 0x2000
erase and write 0x2000 length bytes from memory at 0x10000 address to flash offset at 0x0 using pp write instruction and dofr read instruction. u-boot> sf update pp dofr 0x10000 0x0 0x2000
Signed-off-by: Jagannadha Sutradharudu Teki jagannadh.teki@gmail.com --- common/cmd_sf.c | 10 +++++++--- include/spi_flash_inst.h | 1 + 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/common/cmd_sf.c b/common/cmd_sf.c index 3d9c93e..b971d2a 100644 --- a/common/cmd_sf.c +++ b/common/cmd_sf.c @@ -281,6 +281,8 @@ static int sf_parse_rd_inst_arg(char *arg, u8 *rd_inst) *rd_inst = CMD_READ_ARRAY_FAST; else if (strcmp(arg, "asr") == 0) *rd_inst = CMD_READ_ARRAY_SLOW; + else if (strcmp(arg, "dofr") == 0) + *rd_inst = CMD_READ_DUAL_OUTPUT_FAST; else return 1;
@@ -630,9 +632,10 @@ U_BOOT_CMD( "sf read rd_inst addr offset len\n" " - read `len' bytes starting at\n" " `offset' to memory at `addr' using\n" - " afr | asr `rd_inst' read instructions\n" + " afr | asr | dofr `rd_inst' read instructions\n" " afr (Array Fast Read, 0bh)\n" " asr (Array Slow Read, 02b)\n" + " dofr (Dual Output Fast Read, 3bh)\n" "sf write wr_inst addr offset len\n" " - write `len' bytes from memory\n" " at `addr' to flash at `offset' using\n" @@ -647,8 +650,9 @@ U_BOOT_CMD( " pp | qpp `wr_inst' write instructions and\n" " pp (Page Program, 02h)\n" " qpp (Quad Page Program, 32h)\n" - " afr | asr `rd_inst' read instructions\n" + " afr | asr | dofr `rd_inst' read instructions\n" " afr (Array Fast Read, 0bh)\n" - " asr (Array Slow Read, 02b)" + " asr (Array Slow Read, 02b)\n" + " dofr (Dual Output Fast Read, 3bh)" SF_TEST_HELP ); diff --git a/include/spi_flash_inst.h b/include/spi_flash_inst.h index 85c8e70..f8fcf5e 100644 --- a/include/spi_flash_inst.h +++ b/include/spi_flash_inst.h @@ -31,5 +31,6 @@ /* Read commands */ #define CMD_READ_ARRAY_FAST 0x0b #define CMD_READ_ARRAY_SLOW 0x03 +#define CMD_READ_DUAL_OUTPUT_FAST 0x3b
#endif /* _SPI_FLASH_INST_H_ */