mirror of
https://github.com/openwrt/openwrt.git
synced 2025-03-13 07:54:14 +00:00
c48afca32c
ASUS makes use of U-Boot's fdt_fixup_mtdparts() function which applies the partitions defined in U-Boot's mtdparts and mtdids environment variables to the devicetree passed over to Linux. The undesired side-effect is that in this way also all additional properties and child nodes get wiped, preventing NVMEM cells to be defined for MTD partitions or UBI volumes. To work-around this issue, add an additional compatible string 'u-boot-dont-touch-spi-nand' which can be used instead of 'spi-nand' in case the replacement of the MTD partitions by U-Boot should be skipped alltogether. In practise this is mostly relevant for SPI-NAND which anyway comes only with two partitions nowadays: 'Bootloader' and 'UBI_DEV'. Hence this work-around is applicable for SPI-NAND only. Similar work-arounds for other MTD devices can be created as well should they actually be needed. Signed-off-by: Daniel Golle <daniel@makrotopia.org>
48 lines
1.8 KiB
Diff
48 lines
1.8 KiB
Diff
From 30a04cf5b6ffa1249df72ccd98cef05f37890f89 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Golle <daniel@makrotopia.org>
|
|
Date: Thu, 6 Feb 2025 05:07:20 +0000
|
|
Subject: [PATCH] mtd: spinand: add work-around to prevent bootloader wiping
|
|
mtdparts
|
|
|
|
ASUS makes use of U-Boot's fdt_fixup_mtdparts() function which applies
|
|
the partitions defined in U-Boot's mtdparts and mtdids environment
|
|
variables to the devicetree passed over to Linux.
|
|
|
|
The undesired side-effect is that in this way also all additional
|
|
properties and child nodes get wiped, preventing NVMEM cells to be
|
|
defined for MTD partitions or UBI volumes.
|
|
|
|
To work-around this issue, add an additional compatible string
|
|
'u-boot-dont-touch-spi-nand' which can be used instead of 'spi-nand' in
|
|
case the replacement of the MTD partitions by U-Boot should be skipped
|
|
alltogether.
|
|
|
|
In practise this is mostly relevant for SPI-NAND which anyway comes only
|
|
with two partitions nowadays: 'Bootloader' and 'UBI_DEV'. Hence this
|
|
work-around is applicable for SPI-NAND only. Similar work-arounds for
|
|
other MTD devices can be created as well should they actually be needed.
|
|
|
|
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
|
|
---
|
|
drivers/mtd/nand/spi/core.c | 2 ++
|
|
1 file changed, 2 insertions(+)
|
|
|
|
--- a/drivers/mtd/nand/spi/core.c
|
|
+++ b/drivers/mtd/nand/spi/core.c
|
|
@@ -1441,6 +1441,7 @@ static int spinand_remove(struct spi_mem
|
|
|
|
static const struct spi_device_id spinand_ids[] = {
|
|
{ .name = "spi-nand" },
|
|
+ { .name = "u-boot-dont-touch-spi-nand" },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, spinand_ids);
|
|
@@ -1448,6 +1449,7 @@ MODULE_DEVICE_TABLE(spi, spinand_ids);
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id spinand_of_ids[] = {
|
|
{ .compatible = "spi-nand" },
|
|
+ { .compatible = "u-boot-dont-touch-spi-nand" },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, spinand_of_ids);
|