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powerpc/mpc85xx: Don't relocate exception vectors

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Booke does not require exception vectors to be located at address zero.
U-Boot was doing so anyway, simply because that's how it had been done
on other PPC.  The downside of this is that once the OS is loaded to
address zero, the exception vectors have been overwritten -- which
makes it difficult to diagnose a crash that happens after that point.

The IVOR setup and trap entry code is simplified somewhat as a result.

Also, there is no longer a need to align individual exceptions on 0x100
byte boundaries.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This commit is contained in:
Scott Wood
2015-04-07 20:20:00 -05:00
committed by York Sun
parent 4913229ed6
commit 96d2bb952b
3 changed files with 98 additions and 124 deletions
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4
include/mpc85xx.h
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@@ -6,10 +6,6 @@
#ifndef __MPC85xx_H__
#define __MPC85xx_H__
/* define for common ppc_asm.tmpl */
#define EXC_OFF_SYS_RESET 0x100 /* System reset */
#define _START_OFFSET 0
#if defined(CONFIG_E500)
#include <e500.h>
#endif