diff options
| author | Michael Barkowski <michael.barkowski@freescale.com> | 2008-03-20 13:15:34 -0400 |
|---|---|---|
| committer | Kim Phillips <kim.phillips@freescale.com> | 2008-03-25 19:16:44 -0500 |
| commit | 5bbeea86eb6afb872374cd23217cb3c1018443ed (patch) | |
| tree | 788ab3805bc7a7198f9a106e9752e3c550449901 /cpu/mpc83xx/cpu_init.c | |
| parent | fc549c871f43933396a5b3e21d897023d4b31b8d (diff) | |
| download | u-boot-imx-5bbeea86eb6afb872374cd23217cb3c1018443ed.zip u-boot-imx-5bbeea86eb6afb872374cd23217cb3c1018443ed.tar.gz u-boot-imx-5bbeea86eb6afb872374cd23217cb3c1018443ed.tar.bz2 | |
mpc8323erdb: Improve the system performance
The following changes are based on kernel UCC ethernet performance:
1. Make the CSB bus pipeline depth as 4, and enable the repeat mode
2. Optimize transactions between QE and CSB. Added CFG_SPCR_OPT
switch to enable this setting.
The following changes are based on the App Note AN3369 and
verified to improve memory latency using LMbench:
3. CS0_CONFIG[AP_n_EN] is changed from 1 to 0
4. CS0_CONFIG[ODT_WR_CONFIG] set to 1. Was a reserved setting
previously.
5. TIMING_CFG_1[WRREC] is changed from 3clks to 2clks (based on
Twr=15ns, and this was already the setting in DDR_MODE)
6. TIMING_CFG_1[PRETOACT] is changed from 3clks to 2clks. (based on
Trp=15ns)
7. TIMING_CFG_1[ACTTOPRE] is changed from 9clks to 6clks. (based on
Tras=40ns)
8. TIMING_CFG_1[ACTTORW] is changed from 3clks to 2clks. (based on
Trcd=15ns)
9. TIMING_CFG_1[REFREC] changed from 21 clks to 11clks. (based on
Trfc=75ns)
10. TIMING_CFG_2[FOUR_ACT] is changed from 10 clks to 7clks. (based
on Tfaw=50ns)
11. TIMING_CFG_2[ADD_LAT] and DDR_MODE[AL] changed from 0 to 1 (based
on CL=3 and WL=2).
Signed-off-by: Michael Barkowski <michael.barkowski@freescale.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Diffstat (limited to 'cpu/mpc83xx/cpu_init.c')
| -rw-r--r-- | cpu/mpc83xx/cpu_init.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/cpu/mpc83xx/cpu_init.c b/cpu/mpc83xx/cpu_init.c index e643037..fba5b02 100644 --- a/cpu/mpc83xx/cpu_init.c +++ b/cpu/mpc83xx/cpu_init.c @@ -79,6 +79,12 @@ void cpu_init_f (volatile immap_t * im) (CFG_ACR_RPTCNT << ACR_RPTCNT_SHIFT); #endif +#ifdef CFG_SPCR_OPT + /* Optimize transactions between CSB and other devices */ + im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_OPT) | + (CFG_SPCR_OPT << SPCR_OPT_SHIFT); +#endif + #ifdef CFG_SPCR_TSECEP /* all eTSEC's Emergency priority */ im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_TSECEP) | |