From: Pali Rohár pali@kernel.org
Last 4 bytes of kwbimage boot image is checksum. Verify it via the new spl_check_board_image() function which is called by U-Boot SPL after loading kwbimage.
Signed-off-by: Pali Rohár pali@kernel.org Signed-off-by: Marek Behún marek.behun@nic.cz Reviewed-by: Stefan Roese sr@denx.de --- Changes since v1: - changed uint32_t to u32 --- arch/arm/mach-mvebu/spl.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+)
diff --git a/arch/arm/mach-mvebu/spl.c b/arch/arm/mach-mvebu/spl.c index 4af52c626c..af9e45ac7a 100644 --- a/arch/arm/mach-mvebu/spl.c +++ b/arch/arm/mach-mvebu/spl.c @@ -100,6 +100,33 @@ u32 spl_mmc_boot_mode(const u32 boot_device) } #endif
+static u32 checksum32(void *start, u32 len) +{ + u32 csum = 0; + u32 *p = start; + + while (len > 0) { + csum += *p++; + len -= sizeof(u32); + }; + + return csum; +} + +int spl_check_board_image(struct spl_image_info *spl_image, + const struct spl_boot_device *bootdev) +{ + u32 csum = *(u32 *)(spl_image->load_addr + spl_image->size - 4); + + if (checksum32((void *)spl_image->load_addr, + spl_image->size - 4) != csum) { + printf("ERROR: Invalid data checksum in kwbimage\n"); + return -EINVAL; + } + + return 0; +} + int spl_parse_board_header(struct spl_image_info *spl_image, const struct spl_boot_device *bootdev, const void *image_header, size_t size)