hw/arm/aspeed_ast27x0: Fix unimplemented region overlap with vbootrom

The unimplemented memory region overlaps with the VBootROM address
range, causing incorrect memory layout.

This patch adjusts the size and start address of the unimplemented
region to avoid collision. The IO memory region (ASPEED_DEV_IOMEM) is
now moved to 0x20000 to reserve space for VBootROM at 0x0.

Although the memory range 0x20000 - 0x10000000 is undefined in the
datasheet and should not be required, further testing shows OP-TEE
or U-Boot may access 0x400000 during early boot.
Removing the unimplemented region causes firmware hangs.

To prevent unexpected accesses, retain the region as a safeguard.

Signed-off-by: Steven Lee <steven_lee@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250523093144.991408-4-steven_lee@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c
index 82a5ecff04375d67888d7f37a6a82d1fca2ecb2a..6aa3841b6911fced8fedce1c2d50b6eb74b4c76d 100644 (file)
--- a/hw/arm/aspeed_ast27x0.c
+++ b/hw/arm/aspeed_ast27x0.c
@@ -23,14 +23,14 @@
 #include "qobject/qlist.h"
 #include "qemu/log.h"
 
-#define AST2700_SOC_IO_SIZE          0x01000000
+#define AST2700_SOC_IO_SIZE          0x00FE0000
 #define AST2700_SOC_IOMEM_SIZE       0x01000000
 #define AST2700_SOC_DPMCU_SIZE       0x00040000
 #define AST2700_SOC_LTPI_SIZE        0x01000000
 
 static const hwaddr aspeed_soc_ast2700_memmap[] = {
-    [ASPEED_DEV_IOMEM]     =  0x00000000,
     [ASPEED_DEV_VBOOTROM]  =  0x00000000,
+    [ASPEED_DEV_IOMEM]     =  0x00020000,
     [ASPEED_DEV_SRAM]      =  0x10000000,
     [ASPEED_DEV_DPMCU]     =  0x11000000,
     [ASPEED_DEV_IOMEM0]    =  0x12000000,