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>
diff --git a/hw/xtensa/xtfpga.c b/hw/xtensa/xtfpga.c
index e5a6bba..2c2f997 100644
--- a/hw/xtensa/xtfpga.c
+++ b/hw/xtensa/xtfpga.c
@@ -162,6 +162,23 @@
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 @@
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) {
