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[Qemu-devel] [PATCH 3/4] hw/ds1338.c: ensure OSF can only be cleared
From: |
Antoine Mathys |
Subject: |
[Qemu-devel] [PATCH 3/4] hw/ds1338.c: ensure OSF can only be cleared |
Date: |
Sun, 02 Dec 2012 18:19:59 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 |
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 <address@hidden>
---
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
- [Qemu-devel] [PATCH 3/4] hw/ds1338.c: ensure OSF can only be cleared,
Antoine Mathys <=