On 9/29/20 8:57 AM, Changho Choi wrote:
> Public bug reported:
>
> I currently run qemu with the following options
> `qemu-system-aarch64 -machine mps2-an505 -cpu cortex-m33 -m 16`
>
> For some reason, memory address over 0x2000_7ffc is not accessible.
> It can be tested in gdb as follow.
>
> (gdb) x/x 0x20007ffc
> 0x20007ffc: 0x00000000
> (gdb) x/x 0x20007ffd
> 0x20007ffd: Cannot access memory at address 0x20007ffd
Works for me:
(gdb) x/xg 0x20007ff8
0x20007ff8: 0x0000000000000000
(gdb) x/xw 0x20007ffc
0x20007ffc: 0x00000000
(gdb) x/xh 0x20007ffe
0x20007ffe: 0x0000
(gdb) x/xb 0x20007fff
0x20007fff: 0x00
I suppose GDB uses 32-bit access size by default,
so requesting 32-bit at 0x20007ffd would access
out of bound memory.
> (gdb) x/x 0x20008000
> 0x20008000: Cannot access memory at address 0x20008000
For TYPE_IOTKIT there is only 1 SRAM bank (see armsse_variants[])
initialized to SRAM_ADDR_WIDTH bits, which is 15 by default:
DEFINE_PROP_UINT32("SRAM_ADDR_WIDTH", ARMSSE, sram_addr_width, 15),
So this MPC downstream region is a 32KB SRAM. The size looks correct.
>
> ** Affects: qemu
> Importance: Undecided
> Status: New
>
