D17884.diff
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	diff --git a/sys/dev/vt/hw/efifb/efifb.c b/sys/dev/vt/hw/efifb/efifb.c
	--- a/sys/dev/vt/hw/efifb/efifb.c
	+++ b/sys/dev/vt/hw/efifb/efifb.c
	@@ -103,7 +103,32 @@
	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)
	@@ -141,7 +166,7 @@
	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);