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blob: payload: Add FW_PAYLOAD_FDT_PATH option

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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
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19
blob/fw_common.S
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@@ -27,15 +27,30 @@ _bss_zero:
add a4, a4, __SIZEOF_POINTER__
blt a4, a5, _bss_zero
/* Override pervious arg1 */
add s0, a0, zero
add s1, a1, zero
call fw_prev_arg1
add t1, a0, zero
add a0, s0, zero
add a1, s1, zero
beqz t1, _prev_arg1_override_done
add a1, t1, zero
_prev_arg1_override_done:
/*
* Relocate FDT
* source FDT address = previous arg1
* destination FDT address = next arg1
*
* Note: We will preserve a0 and a1 passed by
* previous booting stage.
*/
beqz a1, _fdt_reloc_done
/* Mask values in a3 and a4 */
li a3, ~0xf
li a4, 0xff
/* t1 = destinetion FDT start address */
/* t1 = destination FDT start address */
add s0, a0, zero
add s1, a1, zero
call fw_next_arg1
@@ -70,7 +85,7 @@ _bss_zero:
or t2, t2, t3
or t2, t2, t4
or t2, t2, t5
/* t2 = destinetion FDT end address */
/* t2 = destination FDT end address */
add t2, t1, t2
/* FDT copy loop */
ble t2, t1, _fdt_reloc_done