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pc, pc64: allocate dma bounce buffer right after xinit()

--- a/sys/src/9/pc/main.c

+++ b/sys/src/9/pc/main.c

@@ -39,10 +39,10 @@

 	ramdiskinit();

 	confinit();

 	xinit();

-	pcicfginit();

-	bootscreeninit();

 	if(i8237alloc != nil)

 		i8237alloc();

+	pcicfginit();

+	bootscreeninit();

 	trapinit();

 	printinit();

 	cpuidprint();

--- a/sys/src/9/pc64/main.c

+++ b/sys/src/9/pc64/main.c

@@ -191,10 +191,10 @@

 	ramdiskinit();

 	confinit();

 	xinit();

-	pcicfginit();

-	bootscreeninit();

 	if(i8237alloc != nil)

 		i8237alloc();

+	pcicfginit();

+	bootscreeninit();

 	trapinit();

 	printinit();

 	cpuidprint();

-- 

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