The following devices have a Winbond W25Q256FV flash chip,
which does not have the RESET pin enabled by default,
and otherwise would require setting a bit in a status register.
Before moving to Linux 5.4, we had the patch:
0053-mtd-spi-nor-add-w25q256-3b-mode-switch.patch
which kept specific flash chips with explicit 3-byte and 4-byte address modes
to stay in 3-byte address mode while idle (after an erase or write)
by using a custom flag SPI_NOR_4B_READ_OP that was part of the patch.
this was obsoleted by the patch:
481-mtd-spi-nor-rework-broken-flash-reset-support.patch
which uses the newer upstream flag SNOR_F_BROKEN_RESET
for devices with a flash chip that cannot be hardware reset with RESET pin
and therefore must be left in 3-byte address mode when idle.
The new patch requires that the DTS of affected devices
have the property "broken-flash-reset", which was not yet added for most of them.
This commit adds the property for remaining affected devices in ramips target,
specifically because of the flash chip model.
However, it is possible that there are other devices
where the flash chip uses an explicit 4-byte address mode
and the RESET pin is not connected to the SOC on the board,
and those DTS would also need this property.
Ref: 22d982ea00 ("ramips: add support for switching between 3-byte and 4-byte addressing")
Ref: dfa521f129 ("generic: spi-nor: rework broken-flash-reset")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
[pepe2k@gmail.com: backported to 21.02]
Fixes: #9655, #9636, #9547
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>
(backported from commit 74516f4357)
Specifications:
- SoC: MediaTek MT7688AN
- RAM: 128 MB
- Flash: 32 MB
- Ethernet: 5x 10/100 (1x WAN, 4x LAN)
- Wireless: built in 2.4GHz (bgn)
- USB: 1x USB 2.0 port
- Buttons: 1x Reset
- LEDs: 1x (WiFi)
Flash instructions:
- Configure TFTP server with IP address 10.10.10.3
- Name the firmware file as firmware.bin
- Connect any Ethernet port to the TFTP server's LAN
- Choose option 2 in U-Boot
- Alternatively choose option 7 to upload firmware to the built-in
web server
MAC addresses as verified by OEM firmware:
use address source
2g *:XX factory 0x4
LAN *:XX+1 factory 0x28
WAN *:XX+1 factory 0x2e
Notes:
This board is ostensibly a module containing the MediaTek MT7688AN SoC,
128 MB DDR2 SDRAM and 32 MB flash storage. The SoC can be operated in
IoT Gateway Mode or IoT Device Mode.
From some vendors the U-Boot that comes installed operates on UART 2
which is inaccessible in gateway mode and operates unreliably in the
Linux kernel when using more than 64 MB of RAM. For those, updating
U-Boot is recommended.
Signed-off-by: Ewan Parker <ewan@ewan.cc>
[add WLAN to 01_leds]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
