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vmx(1): VGA framebuffer should be normal memory

--- a/sys/src/cmd/vmx/vmx.c

+++ b/sys/src/cmd/vmx/vmx.c

@@ -651,7 +651,7 @@

 	if(gmemsz < 1<<20) sysfatal("640 KB of RAM is not enough for everyone");

 	mkregion(0, 0xa0000, REGALLOC|REGFREE|REGRWX);

-	mkregion(0xa0000, 0xc0000, REGALLOC);

+	mkregion(0xa0000, 0xc0000, REGALLOC|REGRWX);

 	mkregion(0xc0000, 0x100000, REGALLOC|REGRES|REGRWX);

 	if(fbsz != 0 && fbaddr < gmemsz){

 		mkregion(0x100000, fbaddr, REGALLOC|REGFREE|REGRWX);