Per the datasheet, the OSF bit in the control register can only be
cleared. Attempts to set it have no effect. Implement this.
Signed-off-by: Antoine Mathys <barsa...@gmail.com>
---
hw/ds1338.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/ds1338.c b/hw/ds1338.c
index 1fb152e..f3c6bc5 100644
--- a/hw/ds1338.c
+++ b/hw/ds1338.c
@@ -160,7 +160,12 @@ static int ds1338_send(I2CSlave *i2c, uint8_t data)
}
s->offset = qemu_timedate_diff(&now);
} else if (s->ptr == 7) {
- /* Control register. Currently ignored. */
+ /* Control register. */
+
+ /* Attempting to write the OSF flag to logic 1 leaves the
+ value unchanged. */
+ data = (data & 0xDF) | (data & s->nvram[s->ptr] & 0x20);
+
s->nvram[s->ptr] = data;
} else {
s->nvram[s->ptr] = data;
--
1.7.10.4
