Add a RB1xx profile to generate RouterBoard RB1xx series image and kernel command line hack patch

SVN-Revision: 7194

target/linux/adm5120-2.6/patches/140-cmdline_hack.patch

@@ -0,0 +1,50 @@
+diff -ur linux.old/arch/mips/kernel/head.S linux.dev/arch/mips/kernel/head.S
+--- linux.old/arch/mips/kernel/head.S	2006-12-06 17:30:27.000000000 +0100
++++ linux.dev/arch/mips/kernel/head.S	2006-12-06 18:34:43.000000000 +0100
+@@ -129,15 +129,20 @@
+ #endif
+ 	.endm
+ 
+-
+ 	j kernel_entry
+ 	nop
+-
++	nop
++	
+ 	/*
+ 	 * Reserved space for exception handlers.
+ 	 * Necessary for machines which link their kernels at KSEG0.
++	 * Use as temporary storage for the kernel command line, so that it
++	 * can be updated easily without having to relink the kernel.
+ 	 */
+-	.fill	0x400
++	 
++EXPORT(_image_cmdline)
++	.ascii "CMDLINE:"
++	.fill	0x3ec
+ 
+ EXPORT(stext)					# used for profiling
+ EXPORT(_stext)
+diff -ur linux.old/arch/mips/adm5120/prom.c linux.dev/arch/mips/adm5120/prom.c
+--- linux.old/arch/mips/adm5120/prom.c	2006-12-06 17:30:27.000000000 +0100
++++ linux.dev/arch/mips/adm5120/prom.c	2006-12-06 17:41:40.000000000 +0100
+@@ -100,6 +100,7 @@
+ }
+ 
+ 
++extern char _image_cmdline;
+ /*
+  * initialize the prom module.
+  */
+@@ -112,8 +112,10 @@
+ 	mips_machtype = adm5120_board.mach_type;
+ 
+ 	/* init command line, register a default kernel command line */
+-	strcpy(&(arcs_cmdline[0]), CONFIG_CMDLINE);
++	char *cmd = &_image_cmdline + 8;
++	if( strlen(cmd) > 0) strcpy( &(arcs_cmdline[0]), cmd);
++		else strcpy(&(arcs_cmdline[0]), CONFIG_CMDLINE);
+ 
+ 	/* init memory map */
+ 	prom_meminit();
+ }