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ath79: lzma-loader: allow setting custom kernel magic

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...and max flash offset

The mtdsplit parser was recently refactored
to allow the kernel to have custom image header magic.

Let's also do this for the lzma-loader

For example:
When implemented together,
this allows the kernel to "appear" to be a rootfs
by OEM software in order to write an image
that is actually kernel + rootfs.

At the same time,
it would boot to openwrt normally
by setting the same magic in DTS.

Both of the variables
have a default value that is unchanged
when not defined in the makefiles

This has no effect on the size of the loader
when lzma compressed.

Signed-off-by: Michael Pratt <mcpratt@pm.me>
(cherry picked from commit 1b8bd17c2d07c7397015a86941db9e114e1d349a)
This commit is contained in:
Michael Pratt 2021-02-24 22:35:37 -05:00 committed by Petr Štetiar
parent 08ec7acbc3
commit 1f6ec4b29e
4 changed files with 16 additions and 1 deletions
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6
target/linux/ath79/image/Makefile
View File

@ -4,6 +4,7 @@ include $(INCLUDE_DIR)/image.mk
KERNEL_LOADADDR = 0x80060000
DEVICE_VARS += LOADER_FLASH_OFFS LOADER_TYPE
DEVICE_VARS += LOADER_FLASH_MAX LOADER_KERNEL_MAGIC
DEVICE_VARS += NETGEAR_BOARD_ID NETGEAR_HW_ID
DEVICE_VARS += RAS_BOARD RAS_ROOTFS_SIZE RAS_VERSION
@ -30,7 +31,10 @@ define Build/loader-kernel
endef
define Build/loader-okli-compile
$(call Build/loader-common,FLASH_OFFS=$(LOADER_FLASH_OFFS) FLASH_MAX=0)
$(call Build/loader-common, \
FLASH_OFFS=$(LOADER_FLASH_OFFS) \
FLASH_MAX=$(LOADER_FLASH_MAX) \
KERNEL_MAGIC=$(LOADER_KERNEL_MAGIC) )
endef
# Arguments: <output name> <kernel offset>

2
target/linux/ath79/image/lzma-loader/Makefile
View File

@ -13,6 +13,7 @@ LOADADDR := 0x80060000
LOADER := loader.bin
LOADER_NAME := $(basename $(notdir $(LOADER)))
LOADER_DATA :=
KERNEL_MAGIC :=
TARGET_DIR :=
FLASH_OFFS :=
FLASH_MAX :=
@ -41,6 +42,7 @@ loader-compile: $(PKG_BUILD_DIR)/.prepared
LZMA_TEXT_START=$(LZMA_TEXT_START) \
LOADADDR=$(LOADADDR) \
LOADER_DATA=$(LOADER_DATA) \
KERNEL_MAGIC=$(KERNEL_MAGIC) \
FLASH_OFFS=$(FLASH_OFFS) \
FLASH_MAX=$(FLASH_MAX) \
BOARD="$(BOARD)" \

5
target/linux/ath79/image/lzma-loader/src/Makefile
View File

@ -18,6 +18,7 @@
LOADADDR :=
LZMA_TEXT_START := 0x80a00000
LOADER_DATA :=
KERNEL_MAGIC :=
BOARD :=
FLASH_OFFS :=
FLASH_MAX :=
@ -54,6 +55,10 @@ OBJECTS += data.o
CFLAGS += -DLZMA_WRAPPER=1 -DLOADADDR=$(LOADADDR)
endif
ifneq ($(strip $(KERNEL_MAGIC)),)
CFLAGS += -DCONFIG_KERNEL_MAGIC=$(KERNEL_MAGIC)
endif
ifneq ($(strip $(KERNEL_CMDLINE)),)
CFLAGS += -DCONFIG_KERNEL_CMDLINE='"$(KERNEL_CMDLINE)"'
endif

4
target/linux/ath79/image/lzma-loader/src/loader.c
View File

@ -189,7 +189,11 @@ static void lzma_init_data(void)
p = flash_base + flash_ofs;
magic = get_be32(p);
#ifdef CONFIG_KERNEL_MAGIC
if (magic == CONFIG_KERNEL_MAGIC) {
#else
if (magic == IH_MAGIC_OKLI) {
#endif
hdr = (struct image_header *) p;
break;
}