diff options
| -rw-r--r-- | hw/char/escc.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/hw/char/escc.c b/hw/char/escc.c index c87ecd59d8..b0d3b92dc1 100644 --- a/hw/char/escc.c +++ b/hw/char/escc.c @@ -300,9 +300,24 @@ static void escc_reset_chn(ESCCChannelState *s) static void escc_reset(DeviceState *d) { ESCCState *s = ESCC(d); + int i, j; - escc_reset_chn(&s->chn[0]); - escc_reset_chn(&s->chn[1]); + for (i = 0; i < 2; i++) { + ESCCChannelState *cs = &s->chn[i]; + + /* + * According to the ESCC datasheet "Miscellaneous Questions" section + * on page 384, the values of the ESCC registers are not guaranteed on + * power-on until an explicit hardware or software reset has been + * issued. For now we zero the registers so that a device reset always + * returns the emulated device to a fixed state. + */ + for (j = 0; j < ESCC_SERIAL_REGS; j++) { + cs->rregs[j] = 0; + cs->wregs[j] = 0; + } + escc_reset_chn(cs); + } } static inline void set_rxint(ESCCChannelState *s) |