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powerpc: mpc52xx: Clear GD in the main U-Boot stage for SPL usage 

When an MPC5200 based board is used with SPL support, the main
U-Boot needs to clear the GD (global data) struct again.

Otherwise the generic board init code in board_init_f (when
CONFIG_SYS_GENERIC_BOARD is defined) will not initialize all
GD variables correctly. Resulting in a hangup on the a4m2k
board.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Wolfgang Denk <wd@denx.de>
This commit is contained in:
Stefan Roese 2014-11-19 09:37:48 +01:00 committed by Wolfgang Denk
parent c07e8da1a4
commit 5fc3494fdb
1 changed files with 15 additions and 0 deletions
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15
arch/powerpc/cpu/mpc5xxx/start.S
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@ -76,6 +76,21 @@ _start:
* been done in the SPL u-boot version.
*/
GET_GOT /* initialize GOT access */
/*
* The GD (global data) struct needs to get cleared. Lets do
* this by calling memset().
* This function is called when the platform is build with SPL
* support from the main (full-blown) U-Boot. And the GD needs
* to get cleared (again) so that the following generic
* board support code, defined via CONFIG_SYS_GENERIC_BOARD,
* initializes all variables correctly.
*/
mr r3, r2 /* parameter 1: GD pointer */
li r4,0 /* parameter 2: value to fill */
li r5,GD_SIZE /* parameter 3: count */
bl memset
bl board_init_f /* run 1st part of board init code (in Flash)*/
/* NOTREACHED - board_init_f() does not return */
#else