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powerpc/mpc8xxx: Allow DDR overclock

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Allow DDR clock runs faster than SPD specifes. This may cause memory
failure, but the user should know what is going to happen when using
higher than expected DDR clock.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
This commit is contained in:
York Sun
2013-03-25 07:40:08 +00:00
committed by Andy Fleming
parent f69814397e
commit 1b294b7a93
1 changed files with 0 additions and 2 deletions
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2
arch/powerpc/cpu/mpc8xxx/ddr/lc_common_dimm_params.c
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@ -44,7 +44,6 @@ compute_cas_latency_ddr3(const dimm_params_t *dimm_params,
printf("DDR clock (MCLK cycle %u ps) is faster than "
"the slowest DIMM(s) (tCKmin %u ps) can support.\n",
mclk_ps, tCKmin_X_ps);
return 1;
}
/* determine the acutal cas latency */
caslat_actual = (tAAmin_ps + mclk_ps - 1) / mclk_ps;
@ -60,7 +59,6 @@ compute_cas_latency_ddr3(const dimm_params_t *dimm_params,
if (caslat_actual * mclk_ps > 20000) {
printf("The choosen cas latency %d is too large\n",
caslat_actual);
return 1;
}
outpdimm->lowest_common_SPD_caslat = caslat_actual;