Messages in this thread Patch in this message | | | From | Pali Rohár <> | Subject | [PATCH 5/5] arm: boot: store ATAGs structure into DT "/chosen/linux,atags" entry | Date | Mon, 6 Jul 2015 22:26:13 +0200 |
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Legacy bootloaders can pass additional information for kernel or legacy userspace applications. When booting DT kernel then ATAGs structure is not more visible after running kernel uncompress code. This patch stores full ATAGs structure into DT "/chosen/linux,atags" entry, so kernel can later reuse it and export via /proc/atags to userspace.
Signed-off-by: Pali Rohár <pali.rohar@gmail.com> --- arch/arm/boot/compressed/atags_to_fdt.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/compressed/atags_to_fdt.c b/arch/arm/boot/compressed/atags_to_fdt.c index e7e1cc9..ae93973 100644 --- a/arch/arm/boot/compressed/atags_to_fdt.c +++ b/arch/arm/boot/compressed/atags_to_fdt.c @@ -112,7 +112,7 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) * address and size for each bank */ uint32_t mem_reg_property[2 * 2 * NR_BANKS]; int memcount = 0; - int ret, memsize; + int ret, memsize, atag_size; /* make sure we've got an aligned pointer */ if ((u32)atag_list & 0x3) @@ -189,5 +189,9 @@ int atags_to_fdt(void *atag_list, void *fdt, int total_space) 4 * memcount * memsize); } + /* include the terminating ATAG_NONE */ + atag_size = (char *)atag - (char *)atag_list + sizeof(struct tag_header); + setprop(fdt, "/chosen", "linux,atags", atag_list, atag_size); + return fdt_pack(fdt); } -- 1.7.9.5
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