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Don't set even parity uselessly in the line control register (parity

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is not enabled).

Saved a few bytes by reusing the line control register bits and not
loading the speed in the wrong (cpu) register.
This commit is contained in:
Bruce Evans 1998-02-01 22:39:24 +00:00
parent da171a03a8
commit b8c7cb30ab
1 changed files with 4 additions and 5 deletions
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9
sys/i386/boot/biosboot/serial.S
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@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
* $Id: serial.S,v 1.9 1997/07/13 15:24:15 bde Exp $
* $Id: serial.S,v 1.10 1998/01/01 13:01:31 bde Exp $
*/
/*
@ -151,10 +151,10 @@ ENTRY(init_serial)
outb %al, %dx # enable DLAB
subl $3, %edx # divisor latch, low byte
mov $COMBRD(CONSPEED), %ax
movb $COMBRD(CONSPEED) & 0xff, %al
outb %al, %dx
incl %edx # divisor latch, high byte
movb %ah, %al
movb $COMBRD(CONSPEED) >> 8, %al
outb %al, %dx
incl %edx # fifo control register (if any)
@ -162,11 +162,10 @@ ENTRY(init_serial)
outb %al, %dx # disable fifo to reduce worst-case busy-wait
incl %edx # line control reg
movb $0x13, %al
movb $0x03, %al
outb %al, %dx # 8N1
incl %edx # modem control reg
movb $3, %al
outb %al, %dx # enable DTR/RTS
/* Flush the input buffer. */