d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Implement detection of whether or not bounce-buffering is required

Browse Source 
for the particular card in use.  At the moment, I've set it to any of
the bt445S VLB cards (not the bt445C which apparently work) and the
bt5xx series (isa cards).  The 742 and PCI cards should not need it. :-)

It may be useful to have something like this:
#ifndef BOUNCE_BUFFERS
  if (bounce_buffers_required && more_than_16MB_ram)
    panic("this card requires bounce buffers for more than 16MB ram!")
#endif
This commit is contained in:
peter 1995-12-07 09:13:48 +00:00
parent c0273b2f64
commit 53a232b78e
1 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
sys/i386/isa/bt742a.c
View File

@ -12,7 +12,7 @@
* on the understanding that TFS is not responsible for the correct
* functioning of this software in any circumstances.
*
* $Id: bt742a.c,v 1.43 1995/11/04 17:07:08 bde Exp $
* $Id: bt742a.c,v 1.44 1995/12/06 23:50:06 bde Exp $
*/
/*
@ -382,6 +382,7 @@ struct bt_data {
int bt_dma; /* DMA channel read of board */
int bt_scsi_dev; /* adapters scsi id */
int numccbs; /* how many we have malloc'd */
int bt_bounce; /* should we bounce? */
struct scsi_link sc_link; /* prototype for devs */
} *btdata[NBT];
@ -702,7 +703,7 @@ btattach(dev)
bt->sc_link.adapter_targ = bt->bt_scsi_dev;
bt->sc_link.adapter = &bt_switch;
bt->sc_link.device = &bt_dev;
bt->sc_link.flags = SDEV_BOUNCE;
bt->sc_link.flags = bt->bt_bounce ? SDEV_BOUNCE : 0;
/*
* Prepare the scsibus_data area for the upperlevel
@ -1173,15 +1174,21 @@ bt_init(unit)
return (ENXIO);
break;
}
if ( binfo.id[0] == '5' ) {
if ( binfo.id[0] == '4' && binfo.id[1] == '4' && binfo.id[2] == '5' &&
binfo.id[3] == 'S' ) {
printf("bt%d: Your card cannot DMA above 16MB boundary. Bounce buffering enabled.\n", unit);
bt->bt_bounce++;
} else if ( binfo.id[0] == '5' ) {
printf("bt%d: This driver is designed for using 32 bit addressing\n",unit);
printf("bt%d: mode firmware and EISA/PCI/VLB bus architectures\n",unit);
printf("bt%d: Bounce-buffering will be used (and is necessary)\n", unit);
printf("bt%d: if you have more than 16MBytes memory.\n",unit);
bt->bt_bounce++;
} else if ( info.bus_type == BT_BUS_TYPE_24bit ) {
printf("bt%d: Your board should report a 32bit bus architecture type..\n",unit);
printf("bt%d: The firmware on your board may have a problem with over\n",unit);
printf("bt%d: 16MBytes memory handling with this driver.\n",unit);
bt->bt_bounce++;
}
/*