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bcm: flush out early boot messages on uart and screen initialization

make early boot messages available by writing out
kmesg.buf after uart and screen initialization.

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

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

@@ -197,8 +197,9 @@

 	uartctl(uart, "l8 pn s1");

 	if(*cmd != '\0')

 		uartctl(uart, cmd);

-	consuart = uart;

 	uart->console = 1;

+	consuart = uart;

+	uartputs(kmesg.buf, kmesg.n);

 }

 void

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

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

@@ -162,6 +162,7 @@

 	memimageinit();

 	memdefont = getmemdefont();

 	screenwin();

+	myscreenputs(kmesg.buf, kmesg.n);

 	screenputs = myscreenputs;

 	swcursorinit();

 }