kernel/ipq806x: Restore kernel files for v6.1

[openwrt/staging/ansuel.git] / target / linux / ipq806x / patches-6.1 / 901-02-ARM-decompressor-add-option-to-ignore-MEM-ATAGs.patch

diff --git a/target/linux/ipq806x/patches-6.1/901-02-ARM-decompressor-add-option-to-ignore-MEM-ATAGs.patch b/target/linux/ipq806x/patches-6.1/901-02-ARM-decompressor-add-option-to-ignore-MEM-ATAGs.patch
new file mode 100644 (file)
index 0000000..2e4c4de
--- /dev/null
+++ b/target/linux/ipq806x/patches-6.1/901-02-ARM-decompressor-add-option-to-ignore-MEM-ATAGs.patch
@@ -0,0 +1,54 @@
+From 781d7cd4c3364e9d38fa12a342c5ad4c7e33a5ba Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Fri, 19 Jan 2024 20:33:10 +0100
+Subject: [PATCH v2 2/2] ARM: decompressor: add option to ignore MEM ATAGs
+
+Some bootloaders can pass broken MEM ATAGs that provide hardcoded
+information about mounted RAM size and physical location.
+Example booloader provide RAM of size 1.7Gb but actual mounted RAM
+size is 512Mb causing kernel panic.
+
+Add option CONFIG_ARM_ATAG_DTB_COMPAT_IGNORE_MEM to ignore these ATAG
+and not augument appended DTB memory node.
+
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+Acked-by: Linus Walleij <linus.walleij@linaro.org>
+---
+ arch/arm/Kconfig                        | 12 ++++++++++++
+ arch/arm/boot/compressed/atags_to_fdt.c |  4 ++++
+ 2 files changed, 16 insertions(+)
+
+--- a/arch/arm/Kconfig
++++ b/arch/arm/Kconfig
+@@ -1570,6 +1570,18 @@ config ARM_ATAG_DTB_COMPAT
+         bootloaders, this option allows zImage to extract the information
+         from the ATAG list and store it at run time into the appended DTB.
+ 
++config ARM_ATAG_DTB_COMPAT_IGNORE_MEM
++      bool "Ignore MEM ATAG information from bootloader"
++      depends on ARM_ATAG_DTB_COMPAT
++      help
++        Some bootloaders can pass broken MEM ATAGs that provide hardcoded
++        information about mounted RAM size and physical location.
++        Example booloader provide RAM of size 1.7Gb but actual mounted RAM
++        size is 512Mb causing kernel panic.
++
++        Enable this option if MEM ATAGs should be ignored and the memory
++        node in the appended DTB should NOT be augumented.
++
+ choice
+       prompt "Kernel command line type" if ARM_ATAG_DTB_COMPAT
+       default ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER
+--- a/arch/arm/boot/compressed/atags_to_fdt.c
++++ b/arch/arm/boot/compressed/atags_to_fdt.c
+@@ -169,6 +169,10 @@ int atags_to_fdt(void *atag_list, void *
+                               setprop_string(fdt, "/chosen", "bootargs",
+                                              atag->u.cmdline.cmdline);
+               } else if (atag->hdr.tag == ATAG_MEM) {
++                      /* Bootloader MEM ATAG are broken and should be ignored */
++                      if (IS_ENABLED(CONFIG_ARM_ATAG_DTB_COMPAT_IGNORE_MEM))
++                              continue;
++
+                       if (memcount >= sizeof(mem_reg_property)/4)
+                               continue;
+                       if (!atag->u.mem.size)