gptboot, zfsboot, gptzfsboot: Enable the video and serial consoles early

Normally the serial console is not enabled until /boot.config is read and
we know how the serial console should be configured.  Initialize the
consoles early in 'dual' mode (serial & keyboard) with a default serial
rate of 115200. Then serial is re-initialized once the disk is decrypted
and the /boot.config file can be read.

This allows the GELIBoot passphrase to be provided via the serial console.

PR:		221526
Requested by:	many
Reviewed by:	imp
Sponsored by:	Klara Systems
Differential Revision:	https://reviews.freebsd.org/D15862

1 files changed, 10 insertions, 0 deletions

diff --git a/stand/i386/zfsboot/zfsboot.c b/stand/i386/zfsboot/zfsboot.c
index 8f67121e6ce2..c47b95762250 100644
--- a/stand/i386/zfsboot/zfsboot.c
+++ b/stand/i386/zfsboot/zfsboot.c
@@ -693,6 +693,16 @@ main(void)
     }
     setheap(heap_next, heap_end);
 
+    /*
+     * Initialize the serial console early with a modern default of 115200.
+     * Later, we'll read PATH_DOTCONFIG and reconfigure serial according
+     * to the configuration provided.
+     */
+    opts = OPT_SET(RBX_DUAL);
+    ioctrl = (IO_SERIAL|IO_KEYBOARD);
+    if (sio_init(115200) != 0)
+	ioctrl &= ~IO_SERIAL;
+
     dsk = malloc(sizeof(struct dsk));
     dsk->drive = *(uint8_t *)PTOV(ARGS);
     dsk->type = dsk->drive & DRV_HARD ? TYPE_AD : TYPE_FD;