diff options
Diffstat (limited to 'tools/rkcommon.c')
| -rw-r--r-- | tools/rkcommon.c | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/tools/rkcommon.c b/tools/rkcommon.c index 959585889b..1880fef524 100644 --- a/tools/rkcommon.c +++ b/tools/rkcommon.c @@ -177,7 +177,7 @@ int rkcommon_set_header(void *buf, uint file_size, rkcommon_set_header0(buf, file_size, params); - /* Set up the SPL name and add the AArch64 'nop' padding, if needed */ + /* Set up the SPL name */ memcpy(&hdr->magic, rkcommon_get_spl_hdr(params), RK_SPL_HDR_SIZE); if (rkcommon_need_rc4_spl(params)) @@ -212,17 +212,21 @@ int rkcommon_vrec_header(struct image_tool_params *params, * * 0x0 header0 (see rkcommon.c) * 0x800 spl_name ('RK30', ..., 'RK33') + * (start of the payload for AArch64 payloads: we expect the + * first 4 bytes to be available for overwriting with our + * spl_name) * 0x804 first instruction to be executed - * (image start for AArch32, 'nop' for AArch64)) - * 0x808 second instruction to be executed - * (image start for AArch64) + * (start of the image/payload for 32bit payloads) * - * For AArch64 (ARMv8) payloads, we receive an input file that - * needs to start on an 8-byte boundary (natural alignment), so - * we need to put a NOP at 0x804. + * For AArch64 (ARMv8) payloads, natural alignment (8-bytes) is + * required for its sections (so the image we receive needs to + * have the first 4 bytes reserved for the spl_name). Reserving + * these 4 bytes is done using the BOOT0_HOOK infrastructure. * - * Depending on this, the header is either 0x804 or 0x808 bytes - * in length. + * Depending on this, the header is either 0x800 (if this is a + * 'boot0'-style payload, which has reserved 4 bytes at the + * beginning for the 'spl_name' and expects us to overwrite + * its first 4 bytes) or 0x804 bytes in length. */ if (rkcommon_spl_is_boot0(params)) tparams->header_size = RK_SPL_HDR_START; |