Date: Sun, 25 May 1997 16:16:40 -0400 From: "Donald J. Maddox" <root@cola47.scsn.net> To: Wolfgang Helbig <helbig@MX.BA-Stuttgart.De> Cc: FreeBSD-current@FreeBSD.ORG Subject: Re: sio1: 64 events for device with no tp Message-ID: <19970525161640.02033@cola47.scsn.net> In-Reply-To: <199705251951.VAA00443@helbig.informatik.ba-stuttgart.de>; from Wolfgang Helbig on Sun, May 25, 1997 at 09:51:22PM %2B0200 References: <199705251951.VAA00443@helbig.informatik.ba-stuttgart.de>
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On Sun, May 25, 1997 at 09:51:22PM +0200, Wolfgang Helbig wrote:
> Hi,
>
> The above kernel message shows up during booting for both sio0 and sio1.
> Up to now its just annoying -- the messages are repeated once
> syslogd is started.
>
> This behaviour seems buggy to me. These messages were not
> by the release 1.164 sio driver. The kernel is pretty current,
> using release 1.169 of sio.c. (FreeBSD-current)
>
> Only the serial interface 0 is used on this system, connected to
> a mouse. It still works.
>
> Maybe there is some bug in sio.c to be fixed ?
The following is a patch from phk that will stop the messages... If you
want to enable the COM_BIGFIFO stuff, set FLAGS=0x20000 in the sio lines in
your config file (COM_BIGFIFO doesn't work for my Motorola ModemSurfer Modem.
YMMV).
----------------------------CUT HERE-----------------------
Index: sio.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/isa/sio.c,v
retrieving revision 1.167
diff -u -r1.167 sio.c
--- sio.c 1997/05/18 21:22:11 1.167
+++ sio.c 1997/05/22 06:50:53
@@ -121,6 +121,7 @@
#define COM_NOFIFO(dev) ((dev)->id_flags & 0x02)
#define COM_VERBOSE(dev) ((dev)->id_flags & 0x80)
#define COM_NOTST3(dev) ((dev)->id_flags & 0x10000)
+#define COM_BIGFIFO(dev) ((dev)->id_flags & 0x20000)
#define com_scr 7 /* scratch register for 16450-16550 (R/W) */
@@ -884,45 +885,40 @@
case FIFO_RX_HIGH:
if (COM_NOFIFO(isdp)) {
printf(" 16550A fifo disabled");
+ } else if (!COM_BIGFIFO(isdp)) {
+ printf(" 16550A");
} else {
/* Detect the fifo size. */
int i, n;
/* Enable and reset the FIFO. */
- outb (iobase+com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST);
+ outb(iobase+com_fifo, FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST);
- /* Set the loopback mode, 57600 baud. */
- outb (iobase+com_cfcr, CFCR_DLAB);
- outb (iobase+com_dlbh, 0);
- outb (iobase+com_dlbl, 2);
- outb (iobase+com_cfcr, CFCR_8BITS);
- outb (iobase+com_mcr, MCR_LOOPBACK);
- inb (iobase+com_lsr);
+ /* Set the loopback mode, and very low baud. */
+ /* XXX: What happens if this is a serial console ? */
+ outb(iobase+com_cfcr, CFCR_DLAB);
+ outb(iobase+com_dlbh, 0xff);
+ outb(iobase+com_dlbl, 0xff);
+ outb(iobase+com_cfcr, CFCR_8BITS);
+ outb(iobase+com_mcr, MCR_LOOPBACK);
+ inb(iobase+com_lsr);
/* Put data into transmit FIFO and wait until overrun. */
for (i=n=0; i<20000; ++i) {
- unsigned char lsr = inb (iobase+com_lsr);
+ unsigned char lsr = inb(iobase+com_lsr);
if (lsr & LSR_OE)
break;
if (lsr & LSR_TXRDY) {
- outb (iobase+com_data, 0x5A);
- ++n;
+ outb(iobase+com_data, 0x5A);
+ n++;
}
}
- outb (iobase+com_mcr, 0);
- outb (iobase+com_fifo, 0);
+ outb(iobase+com_mcr, com->mcr_image);
+ outb(iobase+com_fifo, 0);
com->hasfifo = TRUE;
- if (n > 40) {
- com->tx_fifo_size = 64;
- printf(" 16750");
- } else if (n > 24) {
- com->tx_fifo_size = 32;
- printf(" 16650");
- } else {
- com->tx_fifo_size = 16;
- printf(" 16550A");
- }
+ com->tx_fifo_size = n;
+ printf(" 16550A lookalike with %d bytes xmit-FIFO",n);
#ifdef COM_ESP
for (espp = likely_esp_ports; *espp != 0; espp++)
if (espattach(isdp, com, *espp)) {
@@ -931,31 +927,6 @@
}
#endif
}
-#if 0
- /*
- * Check for the Startech ST16C650 chip.
- * it has a shadow register under the com_iir,
- * which can only be accessed when cfcr == 0xff
- */
- {
- u_char i, j;
-
- i = inb(iobase + com_iir);
- outb(iobase + com_cfcr, 0xff);
- outb(iobase + com_iir, 0x0);
- outb(iobase + com_cfcr, CFCR_8BITS);
- j = inb(iobase + com_iir);
- outb(iobase + com_iir, i);
- if (i != j) {
- printf(" 16550A");
- } else {
- com->tx_fifo_size = 32;
- printf(" 16650");
- }
- if (!com->tx_fifo_size)
- printf(" fifo disabled");
- }
-#endif
break;
}
#ifdef COM_ESP
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