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bcm: don't use PADDR() to convert bus address to physical in vcore

--- a/sys/src/9/bcm/vcore.c

+++ b/sys/src/9/bcm/vcore.c

@@ -211,7 +211,7 @@

 	vcwrite(ChanFb, dmaaddr(fi));

 	if(vcread(ChanFb) != 0)

 		return 0;

-	va = mmukmap(FRAMEBUFFER, PADDR(fi->base), fi->screensize);

+	va = mmukmap(FRAMEBUFFER, (fi->base&~0xC0000000)|PHYSDRAM, fi->screensize);

 	if(va)

 		memset((char*)va, 0x7F, fi->screensize);

 	return (void*)va;