mISDN: Add XHFC support for embedded Speech-Design board to hfcmulti

New version without emulating arch specific stuff for the other
architectures, the special IO and init functions for the 8xx
microcontroller are in a separate include file.

Signed-off-by: Andreas Eversberg <andreas@eversberg.eu>
Signed-off-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index d19b4f6..0586618 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -947,6 +947,10 @@
 	if (current_conf >= 0) {
 join_members:
 		list_for_each_entry(member, &conf->mlist, list) {
+			/* if no conference engine on our chip, change to
+			 * software */
+			if (!member->dsp->features.hfc_conf)
+				goto conf_software;
 			/* in case of hdlc, change to software */
 			if (member->dsp->hdlc)
 				goto conf_software;