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Make zs_iflush not loop indefinitly. Some Mac PowerBooks lie about having 

two SCC channels, and can get stuck in an infinite loop. This change
stops after flushing 4 bytes. Might need upping to 8 bytes if we support
85230 ESCC's.

Idea bounced off of scottr & gwr
This commit is contained in:
wrstuden 1998-03-05 22:03:34 +00:00
parent 15a8029930
commit 84c6b9dbd7
1 changed files with 7 additions and 2 deletions
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9
sys/dev/ic/z8530sc.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: z8530sc.c,v 1.7 1998/02/19 21:26:10 mycroft Exp $ */
/* $NetBSD: z8530sc.c,v 1.8 1998/03/05 22:03:34 wrstuden Exp $ */
/*
* Copyright (c) 1994 Gordon W. Ross
@ -92,8 +92,13 @@ zs_iflush(cs)
struct zs_chanstate *cs;
{
u_char c, rr0, rr1;
int i;
for (;;) {
/*
* Count how many times we loop. Some systems, such as some
* Apple PowerBooks, claim to have SCC's which they really don't.
*/
for (i=0; i<4; i++) {
/* Is there input available? */
rr0 = zs_read_csr(cs);
if ((rr0 & ZSRR0_RX_READY) == 0)