debug NetBSD/hp300 sti(4) framebuffer console with com(4) console output

sti-debug-comconsole.diff

Index: arch/hp300/dev/com_dio.c
===================================================================
RCS file: /cvsroot/src/sys/arch/hp300/dev/com_dio.c,v
retrieving revision 1.10
diff -u -p -d -r1.10 com_dio.c
--- arch/hp300/dev/com_dio.c	16 Jan 2024 05:48:28 -0000	1.10
+++ arch/hp300/dev/com_dio.c	30 May 2025 16:52:13 -0000
@@ -182,7 +182,7 @@ com_dio_cnattach(bus_space_tag_t bst, bu
 	bus_space_unmap(iot, iohdca, DCA_SIZE);
 
 	switch (id) {
-#ifdef CONSCODE
+#if 1// #ifdef CONSCODE
 	case DCAID0:
 	case DCAID1:
 #endif
Index: arch/hp300/hp300/autoconf.c
===================================================================
RCS file: /cvsroot/src/sys/arch/hp300/hp300/autoconf.c,v
retrieving revision 1.117
diff -u -p -d -r1.117 autoconf.c
--- arch/hp300/hp300/autoconf.c	27 May 2025 18:56:27 -0000	1.117
+++ arch/hp300/hp300/autoconf.c	30 May 2025 16:52:13 -0000
@@ -825,11 +825,19 @@ hp300_cninit(void)
 #if NCOM_FRODO > 0
 	if (!com_frodo_cnattach(bst, FRODO_BASE + FRODO_APCI_OFFSET(1),
 	    CONSCODE_INTERNAL))
+#if 0
 		return;
+#else
+		;	/* continue to probe framebufrers with com(4) console */
+#endif
 #endif
 #if NCOM_DIO > 0
 	if (!dio_scan(com_dio_cnattach))
+#if 0
 		return;
+#else
+		;	/* continue to probe framebufrers with com(4) console */
+#endif
 #endif
 #if NDCM > 0
 	if (!dio_scan(dcmcnattach))
Index: dev/ic/sti.c
===================================================================
RCS file: /cvsroot/src/sys/dev/ic/sti.c,v
retrieving revision 1.46
diff -u -p -d -r1.46 sti.c
--- dev/ic/sti.c	30 May 2025 13:42:33 -0000	1.46
+++ dev/ic/sti.c	30 May 2025 16:52:13 -0000
@@ -1486,6 +1486,23 @@ sti_alloc_attr(void *v, int fg, int bg, 
 	return 0;
 }
 
+#define STIDEBUG_COMCONSOLE
+#ifdef STIDEBUG_COMCONSOLE
+#define COM_MAJOR	12	/* on hp300 */
+#define COM_MINOR	0	/* 1 for 425e frodo */
+#include <dev/cons.h>
+extern void comcnputc(dev_t, int);
+static void (*cnputc_save)(dev_t, int);
+static dev_t cn_dev_com;
+
+static void
+cnputc_debug(dev_t dev, int c)
+{
+        (*cnputc_save)(dev, c);
+        comcnputc(cn_dev_com, c);
+}
+#endif
+
 /*
  * Early console support.  Only used on hp300, currently
  */
@@ -1521,6 +1538,12 @@ sti_cnattach(struct sti_rom *rom, struct
 	sti_alloc_attr(scr, 0, 0, 0, &defattr);
 	wsdisplay_cnattach(&scr->scr_wsd, scr, 0, 0, defattr);
 
+#ifdef STIDEBUG_COMCONSOLE
+	cn_dev_com = makedev(COM_MAJOR, COM_MINOR);
+	cnputc_save = cn_tab->cn_putc;
+	cn_tab->cn_putc = cnputc_debug;
+#endif
+
 	return 0;
 }