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[Qemu-devel] [PATCH v2] Enable 8-byte wide MMIO for 16550 serial devices
From: |
Mike Nawrocki |
Subject: |
[Qemu-devel] [PATCH v2] Enable 8-byte wide MMIO for 16550 serial devices |
Date: |
Mon, 6 Nov 2017 11:10:39 -0500 |
Some drivers for the PPMC7400 PowerPC evaluation board accesses the
serial registers through the floating point unit (stfd/ldfd), which is
an 8-byte wide access. This patch enables that behavior.
Signed-off-by: Mike Nawrocki <address@hidden>
---
hw/char/serial.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/hw/char/serial.c b/hw/char/serial.c
index 376bd2f240..eb72191ee7 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -1005,7 +1005,7 @@ static void serial_mm_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
SerialState *s = opaque;
- value &= ~0u >> (32 - (size * 8));
+ value &= 255;
serial_ioport_write(s, addr >> s->it_shift, value, 1);
}
@@ -1014,16 +1014,22 @@ static const MemoryRegionOps serial_mm_ops[3] = {
.read = serial_mm_read,
.write = serial_mm_write,
.endianness = DEVICE_NATIVE_ENDIAN,
+ .valid.max_access_size = 8,
+ .impl.max_access_size = 8,
},
[DEVICE_LITTLE_ENDIAN] = {
.read = serial_mm_read,
.write = serial_mm_write,
.endianness = DEVICE_LITTLE_ENDIAN,
+ .valid.max_access_size = 8,
+ .impl.max_access_size = 8,
},
[DEVICE_BIG_ENDIAN] = {
.read = serial_mm_read,
.write = serial_mm_write,
.endianness = DEVICE_BIG_ENDIAN,
+ .valid.max_access_size = 8,
+ .impl.max_access_size = 8,
},
};
--
2.14.2
- [Qemu-devel] [PATCH v2] Enable 8-byte wide MMIO for 16550 serial devices,
Mike Nawrocki <=