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| author | Anup Patel <anup.patel@wdc.com> | 2020-05-24 07:33:13 +0300 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2020-06-05 06:32:34 +0300 |
| commit | 86ec5341e421b3f6ac39c75da648b7a22e56f248 (patch) | |
| tree | cfb4031238ab67050302a1eadd8eaa84eb8e71fe /firmware | |
| parent | 4ce6b7a82ac2c9f57186c00f23223dd39067555b (diff) | |
| download | opensbi-86ec5341e421b3f6ac39c75da648b7a22e56f248.tar.xz | |
firmware: Allow fw_platform_init() to return updated FDT location
Currently, the fw_platform_init() does not return anything but we can
further improve by allowing fw_platform_init() to return updated FDT
location.
It is certainly not mandatory for fw_platform_init() to return a new
location of FDT (or modify FDT). In fact, the fw_platform_init() can
always return the original FDT location (i.e. 'arg1') unmodified.
This new capability of fw_platform_init() will allow platforms to:
1. Have multiple built-in FDTs and select one
2. Modify FDT before using based on platform specific straps or OTP
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/fw_base.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/firmware/fw_base.S b/firmware/fw_base.S index b354cb8..b66ac41 100644 --- a/firmware/fw_base.S +++ b/firmware/fw_base.S @@ -198,7 +198,9 @@ _prev_arg1_override_done: */ MOV_5R s0, a0, s1, a1, s2, a2, s3, a3, s4, a4 call fw_platform_init + add t0, a0, zero MOV_5R a0, s0, a1, s1, a2, s2, a3, s3, a4, s4 + add a1, t0, zero /* Preload HART details * s7 -> HART Count @@ -475,6 +477,7 @@ _start_hang: .globl fw_platform_init .weak fw_platform_init fw_platform_init: + add a0, a1, zero ret .section .entry, "ax", %progbits |