diff --git a/sys/dev/vt/hw/efifb/efifb.c b/sys/dev/vt/hw/efifb/efifb.c
index 3aaeebcb1b5e..20822629d0c5 100644
--- a/sys/dev/vt/hw/efifb/efifb.c
+++ b/sys/dev/vt/hw/efifb/efifb.c
@@ -1,158 +1,183 @@
 /*-
  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
  *
  * Copyright (c) 2014 The FreeBSD Foundation
  *
  * This software was developed by Aleksandr Rybalko under sponsorship from the
  * FreeBSD Foundation.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
 #include <sys/fbio.h>
 #include <sys/linker.h>
 
 #include "opt_platform.h"
 
 #include <machine/metadata.h>
 #include <machine/vmparam.h>
 #include <vm/vm.h>
 #include <vm/pmap.h>
 
 #include <dev/vt/vt.h>
 #include <dev/vt/hw/fb/vt_fb.h>
 #include <dev/vt/colors/vt_termcolors.h>
 
 static vd_init_t vt_efifb_init;
 static vd_fini_t vt_efifb_fini;
 static vd_probe_t vt_efifb_probe;
 
 static struct vt_driver vt_efifb_driver = {
 	.vd_name = "efifb",
 	.vd_probe = vt_efifb_probe,
 	.vd_init = vt_efifb_init,
 	.vd_fini = vt_efifb_fini,
 	.vd_blank = vt_fb_blank,
 	.vd_bitblt_text = vt_fb_bitblt_text,
 	.vd_invalidate_text = vt_fb_invalidate_text,
 	.vd_bitblt_bmp = vt_fb_bitblt_bitmap,
 	.vd_drawrect = vt_fb_drawrect,
 	.vd_setpixel = vt_fb_setpixel,
 	.vd_fb_ioctl = vt_fb_ioctl,
 	.vd_fb_mmap = vt_fb_mmap,
 	.vd_suspend = vt_suspend,
 	.vd_resume = vt_resume,
 	/* Better than VGA, but still generic driver. */
 	.vd_priority = VD_PRIORITY_GENERIC + 1,
 };
 
 static struct fb_info local_info;
 VT_DRIVER_DECLARE(vt_efifb, vt_efifb_driver);
 
 static int
 vt_efifb_probe(struct vt_device *vd)
 {
 	int		disabled;
 	struct efi_fb	*efifb;
 	caddr_t		kmdp;
 
 	disabled = 0;
 	TUNABLE_INT_FETCH("hw.syscons.disable", &disabled);
 	if (disabled != 0)
 		return (CN_DEAD);
 
 	kmdp = preload_search_by_type("elf kernel");
 	if (kmdp == NULL)
 		kmdp = preload_search_by_type("elf64 kernel");
 	efifb = (struct efi_fb *)preload_search_info(kmdp,
 	    MODINFO_METADATA | MODINFOMD_EFI_FB);
 	if (efifb == NULL)
 		return (CN_DEAD);
 
 	return (CN_INTERNAL);
 }
 
 static int
 vt_efifb_init(struct vt_device *vd)
 {
 	struct fb_info	*info;
 	struct efi_fb	*efifb;
 	caddr_t		kmdp;
+	int		memattr;
 	int		roff, goff, boff;
+	char		attr[16];
+
+	/*
+	 * XXX TODO: I think there's more nuance here than we're acknowledging,
+	 * and we should look into it.  It may be that the framebuffer lives in
+	 * a segment of memory that doesn't support one or both of these.  We
+	 * should likely be consulting the memory map for any applicable
+	 * cacheability attributes before making a final decision.
+	 */
+	memattr = VM_MEMATTR_WRITE_COMBINING;
+	if (TUNABLE_STR_FETCH("hw.efifb.cache_attr", attr, sizeof(attr))) {
+		/*
+		 * We'll allow WC but it's currently the default, UC is the only
+		 * other tested one at this time.
+		 */
+		if (strcasecmp(attr, "wc") != 0 &&
+		    strcasecmp(attr, "uc") != 0) {
+			printf("efifb: unsupported cache attr specified: %s\n",
+			    attr);
+			printf("efifb: expected \"wc\" or \"uc\"\n");
+		} else if (strcasecmp(attr, "uc") == 0) {
+			memattr = VM_MEMATTR_UNCACHEABLE;
+		}
+	}
 
 	info = vd->vd_softc;
 	if (info == NULL)
 		info = vd->vd_softc = (void *)&local_info;
 
 	kmdp = preload_search_by_type("elf kernel");
 	if (kmdp == NULL)
 		kmdp = preload_search_by_type("elf64 kernel");
 	efifb = (struct efi_fb *)preload_search_info(kmdp,
 	    MODINFO_METADATA | MODINFOMD_EFI_FB);
 	if (efifb == NULL)
 		return (CN_DEAD);
 
 	info->fb_type = FBTYPE_EFIFB;
 	info->fb_height = efifb->fb_height;
 	info->fb_width = efifb->fb_width;
 
 	info->fb_depth = fls(efifb->fb_mask_red | efifb->fb_mask_green |
 	    efifb->fb_mask_blue | efifb->fb_mask_reserved);
 	/* Round to a multiple of the bits in a byte. */
 	info->fb_bpp = roundup2(info->fb_depth, NBBY);
 
 	/* Stride in bytes, not pixels */
 	info->fb_stride = efifb->fb_stride * (info->fb_bpp / NBBY);
 
 	roff = ffs(efifb->fb_mask_red) - 1;
 	goff = ffs(efifb->fb_mask_green) - 1;
 	boff = ffs(efifb->fb_mask_blue) - 1;
 	vt_generate_cons_palette(info->fb_cmap, COLOR_FORMAT_RGB,
 	    efifb->fb_mask_red >> roff, roff,
 	    efifb->fb_mask_green >> goff, goff,
 	    efifb->fb_mask_blue >> boff, boff);
 	info->fb_cmsize = NCOLORS;
 
 	info->fb_size = info->fb_height * info->fb_stride;
 	info->fb_pbase = efifb->fb_addr;
 	info->fb_vbase = (intptr_t)pmap_mapdev_attr(info->fb_pbase,
-	    info->fb_size, VM_MEMATTR_WRITE_COMBINING);
+	    info->fb_size, memattr);
 
 	vt_fb_init(vd);
 
 	return (CN_INTERNAL);
 }
 
 static void
 vt_efifb_fini(struct vt_device *vd, void *softc)
 {
 	struct fb_info	*info = softc;
 
 	vt_fb_fini(vd, softc);
 	pmap_unmapdev(info->fb_vbase, info->fb_size);
 }