Hi Gunnar,
... I also thought to that, but it is not so easy, because of at least the following Macros showed below.
We have our board with a MPC855T 50 MHz and two prototypes with a MPC857T 100 MHz. The CPU-Clock cannot be detected automatically. We need at least the following differences:
#elif defined(CONFIG_100MHz) /* for 100 MHz = "50 MHz" |= SCCR_EBDF01 */ #define CFG_SCCR (SCCR_TBS | SCCR_EBDF01 | \ SCCR_COM00 | SCCR_DFSYNC00 | SCCR_DFBRG00 | \ SCCR_DFNL000 | SCCR_DFNH000 | SCCR_DFLCD000 | \ SCCR_RTSEL | SCCR_DFALCD00) #define CFG_PLPRCR ( (4-1)<<PLPRCR_MF_SHIFT | PLPRCR_TEXPS | PLPRCR_TMIST ) #define CONFIG_8xx_GCLK_FREQ 100000000 #else /* up to 50 MHz we use a 1:1 clock (CLKOUT=GCLK2) */ #define CFG_SCCR (SCCR_TBS | \ SCCR_COM00 | SCCR_DFSYNC00 | SCCR_DFBRG00 | \ SCCR_DFNL000 | SCCR_DFNH000 | SCCR_DFLCD000 | \ SCCR_RTSEL | SCCR_DFALCD00) #define CFG_PLPRCR ( (2-1)<<PLPRCR_MF_SHIFT | PLPRCR_TEXPS | PLPRCR_TMIST ) #define CONFIG_8xx_GCLK_FREQ 50000000 #endif /* CONFIG_...MHz */
Ehm... I don't understand. The code above only depends on CONFIG_100MHz and not some CONFIG_MPC855T! Of course you have to compile for a specific clock frequency. But it shouldn't matter if it's a 855T or a 857T!
That's why I thought the FW (compiled for one specific clock) should be able to detect the processor typ...
Steven