[PATCH 1/3] ARM: dts: broadcom: Preserve the XG6846B CFE holding pen

[Linus Walleij]

CFE copies the secondary CPU holding pen to physical address 0x1000.
The secondary-boot reservation covers this area, but its no-map
attribute prevents the reservation from taking effect with the normal
ARM kernel placement.

ARM reserves its initial page tables before scanning reserved-memory.
With TEXT_OFFSET=0x8000, those tables overlap the secondary-boot region.
The reserved-memory code rejects a no-map region overlapping an existing
reservation, leaving the CFE holding pen available for allocation.

Use an ordinary reservation, which can overlap the page-table
reservation while keeping the holding pen reserved. This also matches
the semantics of the vendor device tree's /memreserve/ entry.

Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw at kernel.org>
---
 arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts b/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
index a3616fb7b3a8..6cb221dca0ac 100644
--- a/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
+++ b/arch/arm/boot/dts/broadcom/bcm6846-genexis-xg6846b.dts
@@ -34,7 +34,7 @@ reserved-memory {
 		ranges;
 
 		secondary-boot at 0 {
-			no-map;
+			/* Includes the kernel's initial page tables. */
 			reg = <0x00000000 0x00008000>;
 		};
 		pmc3-firmware at 8000 {

-- 
2.56.0