Hello!
On Wed, Jul 02, 2003 at 08:36:24AM +0200, Steven Scholz wrote:
Wolfgang Denk wrote:
In message 3F014BE5.3080906@imc-berlin.de you wrote:
has someone patched U-Boot to "support" the MPC857T?
Sorry, I am still using PPCBoot V1.6 and made a quick hack for some performance tests.
AFAIK it's basicly a MPC855T. So the only change would be to avoid a boot message like:
CPU: unknown MPC855 (0x07000003) at 80 MHz: 4 kB I-Cache 4 kB D-Cache FEC present
All you need to do is extend the list of types defined in "cpu/mpc8xx/cpu.c" - a patch is welcome.
I'd love to present a patch.
Hope, this helps for a good patch.
Could you please give me a pointer where to find information about the values of
k = (immr << 16) | *((ushort *) & immap->im_cpm.cp_dparam[0xB0]);
? I couldn't find some.
I couldn't neither. I patched the orginal check_CPU function for MPC855 and inserted a call like this: + case 0x07000003: + return (check_CPU_MPC857_HACK(clock, pvr, immr)); + break;
so function check_CPU_MPC857_HACK is almost a copy of check_CPU. the main differences in compare to check_CPU was this: + char pre = 'X'; + char *mid = "xx"; + char *suf; ... + switch(k) { + case 0x07000003: mid = "T"; suf = "B"; m = 1; break; + default: suf = NULL; break; + } ... + if (suf) + printf ("%cPC857%sZPnn%s", pre, mid, suf); + else + printf ("unknown MPC857 (0x%08x)", k); + + printf(" at %s MHz:", strmhz(buf, clock));
Is it possible to find out if it's a 855, 857 or 860 at runtime?
This would be really nice, that is the reason why I first tried the hack like above, but we would have to modify some part of the macro concept.
So that we don't have to rely on DEFINES?
FAIK MPC855T and MPC857T are basicly the same. So could put both on my board without actually changing the firmware. Would be nice if u-boot could figure out which one is actually present.
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 */
also CFG_MAMR_PTA should be modified.
Best regards,
Gunnar Larisch