Re: [U-Boot] FSL DDR3/4 wrlvl_override question

2015-09-03 Thread York Sun
On 09/03/2015 11:09 AM, Joakim Tjernlund wrote: > On Thu, 2015-09-03 at 10:44 -0500, York Sun wrote: >> Jocke, >> >> On 09/03/2015 09:55 AM, Joakim Tjernlund wrote: >>> in drivers/ddr/fsl/options.c we have: >>> >>> #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4) >>> /* >>>

Re: [U-Boot] FSL DDR3/4 wrlvl_override question

2015-09-03 Thread Joakim Tjernlund
On Thu, 2015-09-03 at 10:44 -0500, York Sun wrote: > Jocke, > > On 09/03/2015 09:55 AM, Joakim Tjernlund wrote: > > in drivers/ddr/fsl/options.c we have: > > > > #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4) > > /* > > * due to ddr3 dimm is fly-by topology > > * w

Re: [U-Boot] FSL DDR3/4 wrlvl_override question

2015-09-03 Thread York Sun
Jocke, On 09/03/2015 09:55 AM, Joakim Tjernlund wrote: > in drivers/ddr/fsl/options.c we have: > > #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4) > /* >* due to ddr3 dimm is fly-by topology >* we suggest to enable write leveling to >* meet the tQDSS

[U-Boot] FSL DDR3/4 wrlvl_override question

2015-09-03 Thread Joakim Tjernlund
in drivers/ddr/fsl/options.c we have: #if defined(CONFIG_SYS_FSL_DDR3) || defined(CONFIG_SYS_FSL_DDR4) /* * due to ddr3 dimm is fly-by topology * we suggest to enable write leveling to * meet the tQDSS under different loading. */ popts->wrlvl_en