mediatek: various attempts to fix FM35Q1GA SPI-NAND flash #15375
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Update ARM TrustedFirmware-A to the most recent release of MediaTek downstream patched version released 2024-01-17. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Import pending patches to set pinconf settings for SPI-NAND pins on MT7622 identical to what the old proprietary preloader did. Should further increase the reliability of some SNFI-attached SPI-NAND flash chips. Link: mtk-openwrt/arm-trusted-firmware#7 Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Dont allow x2 read and cache read operations on FM35Q1GA as they seem to be unstable. Also the Linux drivers does not allow x2 ops. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Prior to performing a PROGRAM LOAD RANDOM DATA operation, a WRITE ENABLE (06h) command must be issued to change the contents of the memory array. Following a WRITE ENABLE (06) command, **first a PROGRAM LOAD (02h or 32h) command must be issued to reset the cache**, then issue a PROGRAM LOAD RANDOM DATA (84h or 34h) command This is dirty fix provided to use by MediaTek engineer Sky Huang which may resolve the "OpenWrt Kiss of Death" issue we've been seeing on the Linksys E8450 aka. Belkin RT3200. However, it means that everything has to be re-written with that patch already applied, ie. we need to rebuild the installer once it is part of snapshot builds to have any effect. Users already on FIP-in-UBI layout are advised to re-write 'fip' UBI volume and 'bl2' MTD partition manually once from within Linux after this fix has been applied. A similar fix will also be required for U-Boot. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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@dangowrt - so an u-boot related patch is still missing? |
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@mrkiko thank you for reviewing the patchset. An additional patch for U-Boot would only be needed if we would use this SPI-NAND chip directly on an SPI controller -- but in case of the RT3200/E8450 it is connected via the SNFI interface and the driver is completely different... I hope that all together this (and building a new installer based on all those changes) may resolve the OKD issue, but so far it's still not clear what the cause may be and people in forum have also been reporting the device just dropping dead entirely after a bit more than 3 years of use (coil chirps and no LEDs turn on -- sound like bad capacitor issue), so maybe the hardware design as such is not that great after all... |
While I didn't see the true cause, there are several differences in how OpenWrt uses the flash chip and how the stock firmware does it, and how the features are documented in the chips datasheet. This PR tries to address at least parts of that.
None. I simply forgot I had already opened a pull request for that. Closing in favor of #15112 |
This is a collection of potential fixes for the OKD ("OpenWrt Kiss of Death") issue which has been a curse on the Belkin RT3200 aka. Linksys E8450 router.
It includes changes to TF-A which are discussed here as well as (different) attempts to correct various potential causes in Linux and U-Boot.
See also mtk-openwrt/arm-trusted-firmware#7