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hw/xtensa: allow reads/writes in the system I/O region 

Ignore writes to unassigned areas of system I/O regison and return 0 for
reads. This makes drivers for unimportant unimplemented hardware blocks
happy.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2014-02-17 20:57:45 +04:00
parent 3539bbb93e
commit 8bb3b57544
1 changed files with 19 additions and 1 deletions
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20
hw/xtensa/xtfpga.c
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@ -162,6 +162,23 @@ static void lx60_reset(void *opaque)
cpu_reset(CPU(cpu));
}
static uint64_t lx60_io_read(void *opaque, hwaddr addr,
unsigned size)
{
return 0;
}
static void lx60_io_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
}
static const MemoryRegionOps lx60_io_ops = {
.read = lx60_io_read,
.write = lx60_io_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void lx_init(const LxBoardDesc *board, MachineState *machine)
{
#ifdef TARGET_WORDS_BIGENDIAN
@ -211,7 +228,8 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
memory_region_add_subregion(system_memory, 0, ram);
system_io = g_malloc(sizeof(*system_io));
memory_region_init(system_io, NULL, "lx60.io", 224 * 1024 * 1024);
memory_region_init_io(system_io, NULL, &lx60_io_ops, NULL, "lx60.io",
224 * 1024 * 1024);
memory_region_add_subregion(system_memory, 0xf0000000, system_io);
lx60_fpga_init(system_io, 0x0d020000);
if (nd_table[0].used) {