Firmware/opensbi
8
0
Fork 0
forked from Mirrors/opensbi
Code Pull Requests Activity

blob: payload: Add FW_PAYLOAD_FDT_PATH option

Browse Source 
This patch extends fw_payload blob to provide FW_PAYLOAD_FDT_PATH
option using which we can embed custom FDT in .text section of
fw_payload blob. In other words, FW_PAYLOAD_FDT_PATH is an option
to forcefully override FDT passed by previous booting stage in
a1 register.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2018-12-19 18:32:49 +05:30
committed by Anup Patel
parent bc99e707cd
commit bc4d6108f4
4 changed files with 51 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
blob/fw_payload.S
View File

@@ -9,13 +9,24 @@
#include "fw_common.S"
.align 3
.section .entry, "ax", %progbits
.global fw_prev_arg1
fw_prev_arg1:
/* We return previous arg1 in 'a0' */
#ifdef FW_PAYLOAD_FDT_PATH
la a0, fdt_bin
#else
add a0, zero, zero
#endif
ret
.align 3
.section .entry, "ax", %progbits
.global fw_next_arg1
fw_next_arg1:
/* We return FDT destination address in 'a0' */
/* We return next arg1 in 'a0' */
#ifdef FW_PAYLOAD_FDT_ADDR
/* a0 = destination FDT start address */
li a0, FW_PAYLOAD_FDT_ADDR
#else
add a0, zero, zero
@@ -33,8 +44,16 @@ fw_next_addr:
#define str(s) #s
#define stringify(s) str(s)
#ifdef FW_PAYLOAD_FDT_PATH
.align 3
.section .text, "ax", %progbits
.globl fdt_bin
fdt_bin:
.incbin stringify(FW_PAYLOAD_FDT_PATH)
#endif
.section .payload, "ax", %progbits
.globl payload_bin
.globl payload_bin
payload_bin:
#ifndef FW_PAYLOAD_PATH
wfi