Changes to the Digi/Arnet SYNC driver:

1. Create 2 x 8k transmit buffer blocks in place of the 16k block previously.
   With this change the speed as tested with ttcp on a 2Mbit link went up
   from 206kbyte/s to 236kbyte/s.
2. Change the rest of the functions to also have the definition of the
   return value on a sepperate line.
3. Remove some unused variables.
4. Add code to recover from DMA underruns.
5. Reorder ar_get_packets() to handle errors better.
6. Only allocate a mbuf cluster if the data is more than the mbuf.

(and in a second diff in addition to the above)
7. Stops the occasional DMA underruns that occurred when 2 channels
   are running at 2Mbit/s.

Submitted by: John Hay <jhay@mikom.csir.co.za>

1 files changed, 7 insertions, 1 deletions

diff --git a/sys/dev/ic/hd64570.h b/sys/dev/ic/hd64570.h
index 706e33a..290e402 100644
--- a/sys/dev/ic/hd64570.h
+++ b/sys/dev/ic/hd64570.h
@@ -29,7 +29,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- * $Id: hd64570.h,v 1.2 1995/11/08 16:20:35 jhay Exp $
+ * $Id: hd64570.h,v 1.1.1.1 1995/11/21 02:32:04 peter Exp $
  */
 #ifndef _HD64570_H_
 #define _HD64570_H_
@@ -337,6 +337,12 @@ typedef struct sca_regs
 #define SCA_DIR_BOF             0x20
 #define SCA_DIR_COF             0x10
 
+#define SCA_PCR_BRC             0x10
+#define SCA_PCR_CCC             0x08
+#define SCA_PCR_PR2             0x04
+#define SCA_PCR_PR1             0x02
+#define SCA_PCR_PR0             0x01
+
 typedef struct sca_descriptor
   {
   unsigned short cp;