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fix system config overwrite @ MPC834x and MPC8313 

During 83xx setup the "System I/O configuration register high" gets
overwritten with user defined value if CFG_SICRH is defined.

Regarding to the MPC834x manual (Table 5-28 reve.1) bits 28+29 of SICRH
must keep their reset value regardless of configuration.

On my board (using RGMII) those bits are set after reset - yet it's
unclear where they come from.

The patch keeps both bits on MPC834x and MPC8313.

Signed-off-by: Andre Schwarz <andre.schwarz@matrix-vision.de>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Andre Schwarz 2008-06-23 11:40:56 +02:00 committed by Kim Phillips
parent 4890246a2c
commit 846f1574dd
1 changed files with 5 additions and 0 deletions
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5
cpu/mpc83xx/cpu_init.c
View File

@ -181,8 +181,13 @@ void cpu_init_f (volatile immap_t * im)
/* System General Purpose Register */
#ifdef CFG_SICRH
#if defined(CONFIG_MPC834X) || defined(CONFIG_MPC8313)
/* regarding to MPC34x manual rev.1 bits 28..29 must be preserved */
im->sysconf.sicrh = (im->sysconf.sicrh & 0x0000000C) | CFG_SICRH;
#else
im->sysconf.sicrh = CFG_SICRH;
#endif
#endif
#ifdef CFG_SICRL
im->sysconf.sicrl = CFG_SICRL;
#endif