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escc: fix STATUS_SYNC bit in R_STATUS register 

After an SDLC "Enter hunt" command has been sent the STATUS_SYNC bit should remain
high until the flag byte has been detected. Whilst the ESCC device doesn't yet
implement SDLC mode, without this change the active low STATUS_SYNC is constantly
asserted causing the MacOS OpenTransport extension to hang on startup as it thinks
it is constantly receiving LocalTalk responses during its initial negotiation
phase.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20210903113223.19551-10-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2021-09-03 12:32:23 +01:00
parent 99b0f05841
commit 15a2a1a4d1
1 changed files with 8 additions and 1 deletions
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9
hw/char/escc.c
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@ -94,6 +94,7 @@
#define W_IVEC 2
#define W_RXCTRL 3
#define RXCTRL_RXEN 0x01
#define RXCTRL_HUNT 0x10
#define W_TXCTRL1 4
#define TXCTRL1_PAREN 0x01
#define TXCTRL1_PAREV 0x02
@ -561,7 +562,13 @@ static void escc_mem_write(void *opaque, hwaddr addr,
break;
}
break;
case W_INTR ... W_RXCTRL:
case W_RXCTRL:
s->wregs[s->reg] = val;
if (val & RXCTRL_HUNT) {
s->rregs[R_STATUS] |= STATUS_SYNC;
}
break;
case W_INTR ... W_IVEC:
case W_SYNC1 ... W_TXBUF:
case W_MISC1 ... W_CLOCK:
case W_MISC2 ... W_EXTINT: