PERFORCE change 135792 for review

[Rafal Jaworowski]

http://perforce.freebsd.org/chv.cgi?CH=135792

Change 135792 by raj at raj_mimi on 2008/02/20 14:50:58

	o Don't switch to own stack. We should be fine on U-Boot's original
	  one; this also helps safely return to the caller when something goes
	  wrong in loader's early main() routine.
	
	o Eliminate WITH_UBOOT leftover.

Affected files ...

.. //depot/projects/e500/sys/boot/powerpc/uboot/start.S#8 edit
.. //depot/projects/e500/tools/build/options/WITH_UBOOT#2 delete

Differences ...

==== //depot/projects/e500/sys/boot/powerpc/uboot/start.S#8 (text+ko) ====

@@ -28,18 +28,12 @@
 
 #include <machine/asm.h>
 
-#define STACK_SIZE 8192
-
 /*
  * Entry point to the loader that U-Boot passes control to.
  */
         .text   
         .globl  _start
 _start:
-	/* Fix up a stack */
-	lis	%r1, stack at ha
-	addi	%r1, %r1, stack at l
-	addi	%r1, %r1, (STACK_SIZE - 32)
 	/* Hint where to look for the API signature */
 	lis	%r11, uboot_address at ha
 	addi	%r11, %r11, uboot_address at l
@@ -62,7 +56,7 @@
 	mflr	%r0
 	stw	%r14, 8(%r1)
 	stw	%r0, 20(%r1)
-	/* Restore U-Boot's r14 and r29 */
+	/* Restore U-Boot's r14 */
 	lis	%r11, saved_regs at ha
 	addi	%r11, %r11, saved_regs at l
 	lwz	%r14, 0(%r11)
@@ -70,7 +64,7 @@
 	mfmsr	%r11
 	ori	%r11, %r11, 0x8000 at l
 	mtmsr	%r11
-	/* Call into u-Boot */
+	/* Call into U-Boot */
 	lis	%r11, syscall_ptr at ha
 	addi	%r11, %r11, syscall_ptr at l
 	lwz	%r11, 0(%r11)
@@ -92,10 +86,6 @@
  * Data section
  */
 	.data
-	.align	4
-stack:
-	.space	STACK_SIZE
-
 GLOBAL(syscall_ptr)
 	.long	0
 GLOBAL(saved_regs)