[PATCH 5/5] mtd: spi-nor: winbond: Add support for W25Q51RV-M
From: Miquel Raynal
Date: Fri May 29 2026 - 12:55:29 EST
There is an ID collision with the chip of same density from the JV
family. Both chips are very similar in practice, it is mostly a matter
of electrical differences (mostly power consumption being lower).
As a significant difference, RV chips identify themselves as supporting
the new SFDP (rev F) field which forces an alternate write SR2
opcode (0x31).
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
+ cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
ef4020
+ cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
winbond
+ xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
534644500a0101ff00080117800000ff84010102e00000ffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffffffffffffffe520f3ffffffff1f44eb086b083b42bbfeffffffffff
0000ffff44eb0c200f5210d800001602a60081e214dde96376337a757a75
f7a4d55c39f66dffe970f9a50000000000002c0c0000000066ffffff0000
00000000000000000000ffffffffff0a00fe21ffdcff
+ sha256sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
74d21fecc7faa297b3f77f1136b1dc53f78b2a432629e226675b6384153fd9f9 /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
+ cat /sys/kernel/debug/spi-nor/spi0.0/capabilities
Supported read modes by the flash
1S-1S-1S
opcode 0x13
mode cycles 0
dummy cycles 0
1S-1S-2S
opcode 0x3c
mode cycles 0
dummy cycles 8
1S-2S-2S
opcode 0xbc
mode cycles 2
dummy cycles 2
1S-1S-4S
opcode 0x6c
mode cycles 0
dummy cycles 8
1S-4S-4S
opcode 0xec
mode cycles 2
dummy cycles 4
4S-4S-4S
opcode 0xec
mode cycles 2
dummy cycles 4
Supported page program modes by the flash
1S-1S-1S
opcode 0x12
1S-1S-4S
opcode 0x34
+ cat /sys/kernel/debug/spi-nor/spi0.0/params
name (null)
id ef 40 20 00 00 00
size 64.0 MiB
write size 1
page size 256
address nbytes 4
flags HAS_SR_TB | 4B_OPCODES | HAS_4BAIT | HAS_LOCK | HAS_SR_TB_BIT6 | HAS_4BIT_BP | SOFT_RESET | NO_WP | HAS_SR2_CMP_BIT6
opcodes
read 0xec
dummy cycles 6
erase 0xdc
program 0x34
8D extension repeat
protocols
read 1S-4S-4S
write 1S-1S-4S
register 1S-1S-1S
erase commands
21 (4.00 KiB) [1]
dc (64.0 KiB) [3]
c7 (64.0 MiB)
sector map
region (in hex) | erase mask | overlaid
------------------+------------+---------
00000000-03ffffff | [ 3] | no
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03ffffff | unlocked | 1024
+ dd 'if=/dev/urandom' 'of=./spi_test' 'bs=1M' 'count=2'
[ 25.427347] random: crng init done
2+0 records in
2+0 records out
+ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
+ hexdump spi_read
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0200000
+ sha256sum spi_read
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5 spi_read
+ mtd_debug write /dev/mtd0 0 2097152 spi_test
Copied 2097152 bytes from spi_test to address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
+ sha256sum spi_read spi_test
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_read
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_test
+ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
+ sha256sum spi_read spi_test
4bda3a28f4ffe603c0ec1258c0034d65a1a0d35ab7bd523a834608adabf03cc5 spi_read
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_test
+ mtd_debug info /dev/mtd0
mtd.type = MTD_NORFLASH
mtd.flags = MTD_CAP_NORFLASH
mtd.size = 67108864 (64M)
mtd.erasesize = 65536 (64K)
mtd.writesize = 1
mtd.oobsize = 0
regions = 0
+ alias 'show_sectors=grep -A4 "locked sectors" /sys/kernel/debug/spi-nor/spi0.0/params'
+ flash_lock -u /dev/mtd0
+ flash_lock -i /dev/mtd0
Device: /dev/mtd0
Start: 0
Len: 0x4000000
Lock status: unlocked
Return code: 0
+ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
+ mtd_debug write /dev/mtd0 0 2097152 spi_test
Copied 2097152 bytes from spi_test to address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
+ sha256sum spi_read spi_test
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_read
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_test
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03ffffff | unlocked | 1024
+ flash_lock -l /dev/mtd0
+ flash_lock -i /dev/mtd0
Device: /dev/mtd0
Start: 0
Len: 0x4000000
Lock status: locked
Return code: 1
+ mtd_debug erase /dev/mtd0 0 2097152
Erased 2097152 bytes from address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read
Copied 2097152 bytes from address 0x00000000 in flash to spi_read
+ sha256sum spi_read spi_test
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_read
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_test
+ dd 'if=/dev/urandom' 'of=./spi_test2' 'bs=1M' 'count=2'
2+0 records in
2+0 records out
+ mtd_debug write /dev/mtd0 0 2097152 spi_test2
Copied 2097152 bytes from spi_test2 to address 0x00000000 in flash
+ mtd_debug read /dev/mtd0 0 2097152 spi_read2
Copied 2097152 bytes from address 0x00000000 in flash to spi_read2
+ sha256sum spi_read spi_read2 spi_test spi_test2
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_read
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_read2
cd699acc82353b7769b98547efed68d5300854ed0bbc84bf831b07937bf941a5 spi_test
f506020804f91fb750e8250e091fb2f732319221a645ed575e1b6ed3553d584c spi_test2
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03ffffff | locked | 1024
+ flash_lock -u /dev/mtd0
+ cat /sys/class/mtd/mtd0/size
+ size=67108864
+ cat /sys/class/mtd/mtd0/erasesize
+ bs=65536
+ grep unlocked /sys/kernel/debug/spi-nor/spi0.0/params
+ sed -e 's/.*unlocked | //'
+ nsectors=1024
+ ss=65536
+ bps=1
+ flash_lock -u /dev/mtd0
+ flash_lock -l /dev/mtd0 66977792 2
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03fdffff | unlocked | 1022
03fe0000-03ffffff | locked | 2
+ flash_lock -u /dev/mtd0 66977792 1
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03feffff | unlocked | 1023
03ff0000-03ffffff | locked | 1
+ flash_lock -u /dev/mtd0
+ flash_lock -l /dev/mtd0 58720256 128
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-037fffff | unlocked | 896
03800000-03ffffff | locked | 128
+ flash_lock -u /dev/mtd0
+ flash_lock -l /dev/mtd0 0 2
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-0001ffff | locked | 2
00020000-03ffffff | unlocked | 1022
+ flash_lock -u /dev/mtd0 65536 1
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-0000ffff | locked | 1
00010000-03ffffff | unlocked | 1023
+ all_but_one=1023
+ flash_lock -u /dev/mtd0
+ flash_lock -l /dev/mtd0 65536 1023
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-0000ffff | unlocked | 1
00010000-03ffffff | locked | 1023
+ flash_lock -u /dev/mtd0 65536 1
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-0001ffff | unlocked | 2
00020000-03ffffff | locked | 1022
+ flash_lock -u /dev/mtd0
+ flash_lock -l /dev/mtd0 0 1023
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03feffff | locked | 1023
03ff0000-03ffffff | unlocked | 1
+ flash_lock -u /dev/mtd0 66977792 1
+ grep -A4 'locked sectors' /sys/kernel/debug/spi-nor/spi0.0/params
locked sectors
region (in hex) | status | #sectors
------------------+----------+---------
00000000-03fdffff | locked | 1022
03fe0000-03ffffff | unlocked | 2
---
drivers/mtd/spi-nor/winbond.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index 04ba8fd44a6a..689e5822b009 100644
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -260,7 +260,7 @@ static const struct flash_info winbond_nor_parts[] = {
SPI_NOR_TB_SR_BIT6 | SPI_NOR_4BIT_BP | SPI_NOR_HAS_CMP,
.fixups = &w25q256_fixups,
}, {
- /* W25Q512JV-Q/N */
+ /* W25Q512JV-Q/N, W25Q51RV-Q/N */
.id = SNOR_ID(0xef, 0x40, 0x20),
.flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB | SPI_NOR_TB_SR_BIT6 |
SPI_NOR_4BIT_BP | SPI_NOR_HAS_CMP,
--
2.53.0