diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2014-02-17 20:57:45 +0400 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2015-03-07 15:27:54 +0300 |
| commit | 8bb3b575448aeff086b2849943da47dce3c2b6ec (patch) | |
| tree | cd77e1f629a48db4f1e44b68013ebe499f935d75 | |
| parent | 3539bbb93e944ffde31c61c369ea9eedcc5697a6 (diff) | |
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>
| -rw-r--r-- | hw/xtensa/xtfpga.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/hw/xtensa/xtfpga.c b/hw/xtensa/xtfpga.c index e5a6bba783..2c2f9974a5 100644 --- a/hw/xtensa/xtfpga.c +++ b/hw/xtensa/xtfpga.c @@ -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) { |