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9bootpxe: try /cfg/pxe/default if /cfg/pxe/$ether fails before breaking to the prompt.

--- a/sys/man/8/9boot

+++ b/sys/man/8/9boot

@@ -83,10 +83,12 @@

 .IR 9bootpxe

 will read the file

 .B /cfg/pxe/$ether

+or, if this file is not present,

+.B /cfg/pxe/default

 from the tftp server, where

 .B $ether

 is the MAC address of the client's network card

-in lower case hex, and use this as its

+in lower case hex, and uses this as its

 .IR plan9.ini (8)

 file.

 .SH FILES

--- a/sys/src/boot/pc/pxe.c

+++ b/sys/src/boot/pc/pxe.c

@@ -340,10 +340,11 @@

 	}

 	memmove(path, "/cfg/pxe/", 9);

 	memmove(path+9, mac, 13);

-	if(tftpopen(f = &t, path, yip, sip, gip)){

-		print("no config\r\n");

-		f = 0;

-	}

+	if(tftpopen(f = &t, path, yip, sip, gip))

+		if(tftpopen(f, "/cfg/pxe/default", yip, sip, gip)){

+			print("no config\r\n");

+			f = 0;

+		}

 	for(;;){

 		kern = configure(f, path); f = 0;

 		if(tftpopen(&t, kern, yip, sip, gip)){

-- 

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