[PATCH] platform: Fix payload alignment when FW_TEXT_START isn't 2M/4M aligned

[Anirudh Srinivasan]

The payload for FW_PAYLOAD needs to be placed at a 2M/4M aligned address
(for 64/32 bit systems) and the current makefile uses FW_PAYLOAD_OFFSET
to achieve this. This only works if FW_TEXT_START is already 2M/4M
aligned. Most existing physical/virtual platforms have used a
FW_TEXT_START of 0x0 or 0x80000000, so this hasn't been an issue so far.
If, for example, FW_TEXT_START is 0x80000, the payload would end up
placed at 0x280000 on a 64 bit system, which isn't a 2M aligned
address.

Update the makefile to use FW_PAYLOAD_ALIGN instead. This will ensure
that the address picked for the payload is 2M/4M aligned irrespective of
where FW_TEXT_START is.

Signed-off-by: Anirudh Srinivasan <asrinivasan at oss.tenstorrent.com>
---
To: opensbi at lists.infradead.org
---
 platform/generic/objects.mk  | 4 ++--
 platform/template/objects.mk | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/platform/generic/objects.mk b/platform/generic/objects.mk
index c4a8fee2..ca7fb8b7 100644
--- a/platform/generic/objects.mk
+++ b/platform/generic/objects.mk
@@ -35,9 +35,9 @@ FW_JUMP_FDT_OFFSET=0x2200000
 FW_PAYLOAD=y
 ifeq ($(PLATFORM_RISCV_XLEN), 32)
   # This needs to be 4MB aligned for 32-bit system
-  FW_PAYLOAD_OFFSET=0x400000
+  FW_PAYLOAD_ALIGN=0x400000
 else
   # This needs to be 2MB aligned for 64-bit system
-  FW_PAYLOAD_OFFSET=0x200000
+  FW_PAYLOAD_ALIGN=0x200000
 endif
 FW_PAYLOAD_FDT_OFFSET=$(FW_JUMP_FDT_OFFSET)
diff --git a/platform/template/objects.mk b/platform/template/objects.mk
index f240a557..9b4bc928 100644
--- a/platform/template/objects.mk
+++ b/platform/template/objects.mk
@@ -85,11 +85,11 @@ FW_PAYLOAD=<y|n>
 # This needs to be 4MB aligned for 32-bit support
 # This needs to be 2MB aligned for 64-bit support
 ifeq ($(PLATFORM_RISCV_XLEN), 32)
-FW_PAYLOAD_OFFSET=0x400000
+FW_PAYLOAD_ALIGN=0x400000
 else
-FW_PAYLOAD_OFFSET=0x200000
+FW_PAYLOAD_ALIGN=0x200000
 endif
-# FW_PAYLOAD_ALIGN=0x1000
+# FW_PAYLOAD_OFFSET=0x400000
 # FW_PAYLOAD_PATH="path to next boot stage binary image file"
 # FW_PAYLOAD_FDT_OFFSET=0x2200000
 #

---
base-commit: 2257e9957103aac7df8089a59b9d4bdda7c592ce
change-id: 20260508-payload_alignment-5585a86ec7e4

Best regards,
--  
Anirudh Srinivasan <asrinivasan at oss.tenstorrent.com>