[U-Boot-Users] PPC 405 _start code - Clarification

[Jerry Walden]

sorry - I should clarify -

what I expect to see it what I see in /cpu/start.S which looks like:

	.text
	.long	0x27051956		/* U-Boot Magic Number			*/
	.globl	version_string
version_string:
	.ascii U_BOOT_VERSION
	.ascii " (", __DATE__, " - ", __TIME__, ")"
	.ascii CONFIG_IDENT_STRING, "\0"

/*
 * Maybe this should be moved somewhere else because the current
 * location (0x100) is where the CriticalInput Execption should be.
 */
	. = EXC_OFF_SYS_RESET
	.globl	_start
_start:
#if defined(CONFIG_405GP) || defined(CONFIG_405CR) || defined(CONFIG_405)
*---------------------------------- */
/* Clear and set up some registers. */
/*--------------------------------- */
	addi	r4,r0,0x0000
	mtspr	sgr,r4
	mtspr	dcwr,r4


Instead I see:

fff80100 <_start>:
fff80100:	38 80 00 00 	li	r4,0
fff80104:	7c 99 eb a6 	mtsgr	r4
fff80108:	7c 9a eb a6 	mtdcwr	r4
fff8010c:	7c 94 f3 a6 	mtesr	r4
fff80110:	7c 9a f3 a6 	mttcr	r4
fff80114:	7c 81 03 a6 	mtxer	r4
fff80118:	7c 96 f3 a6 	mtevpr	r4
fff8011c:	38 80 10 00 	li	r4,4096

So hence I am confused....


-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of Jerry
Walden
Sent: Saturday, December 14, 2002 11:49 AM
To: u-boot-users at lists.sourceforge.net
Subject: [U-Boot-Users] PPC 405 _start code


Greetings:

I just build a version of u-boot for the PPC 405GP.

If I disassemble the code that is generated I see the following:

fff80100 <_start>:
fff80100:	38 80 00 00 	li	r4,0
fff80104:	7c 99 eb a6 	mtsgr	r4
fff80108:	7c 9a eb a6 	mtdcwr	r4
fff8010c:	7c 94 f3 a6 	mtesr	r4
fff80110:	7c 9a f3 a6 	mttcr	r4
fff80114:	7c 81 03 a6 	mtxer	r4
fff80118:	7c 96 f3 a6 	mtevpr	r4
fff8011c:	38 80 10 00 	li	r4,4096

So to develop a deeper understanding of how all the pieces fit together
I went to the start.S module under the cpu subdirecory.  There I
see the _start vector - however the code I see in start.S does not
correspond to the code that I disassembled.

What am I missing?

Kindest Regards,

Jerry


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