[console] Add concept of generic console configuration

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/i386/image/bootsector.c

@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <realmode.h>
 #include <biosint.h>
 #include <bootsector.h>
+#include <ipxe/console.h>
 
 /** Vector for storing original INT 18 handler
  *
@@ -60,6 +61,9 @@ int call_bootsector ( unsigned int segment, unsigned int offset,
 		      unsigned int drive ) {
 	int discard_b, discard_D, discard_d;
 
+	/* Reset console, since boot sector will probably use it */
+	console_reset();
+
 	DBG ( "Booting from boot sector at %04x:%04x\n", segment, offset );
 
 	/* Hook INTs 18 and 19 to capture failure paths */

src/arch/i386/image/pxe_image.c

@@ -33,6 +33,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <ipxe/segment.h>
 #include <ipxe/netdevice.h>
 #include <ipxe/features.h>
+#include <ipxe/console.h>
 
 FEATURE ( FEATURE_IMAGE, "PXE", DHCP_EB_FEATURE_PXE, 1 );
 
@@ -74,6 +75,9 @@ static int pxe_exec ( struct image *image ) {
 	/* Set PXE command line */
 	pxe_cmdline = image->cmdline;
 
+	/* Reset console since PXE NBP will probably use it */
+	console_reset();
+
 	/* Start PXE NBP */
 	rc = pxe_start_nbp();