These changes were identified by HighSmith Bill ,Mazzyar and Joseph for
DDR configuration in u-boot code. Some are related to performance, some
affect stability and some correct few basic errors in the current
configuration.
The changes have been tested and found to give better memory latency
figures on MPC8313eRDB.LMBench figures prove it.
The changes are:
- CS0_CONFIG[ AP_n_EN] is changed from 1 to 0
(this may improve performance for application with many read
or write to open pages).
- CS0_CONFIG[ODT_WR_CFG] is currently changed from 100 to
001 (activating all the CS when only one is used may cause
unwanted noise on the system)
- TIMING_CFG_1[ACTTOPRE] is changed from 9clks to 8clks (based on
Tras=45ns)
- TIMING_CFG_1[REFREC] changed from 21 clks to 18clks.
- TIMING_CFG_2[AL] value changed from 0 setting to 1 clk to
comply with the 3 ODT clk requirements)
- TIMING_CFG_2[CPO] was set to a reserved value, changed to RL+3/4.
- TIMING_CFG_2[FOUR_ACT] is changed from 10 clks to 6clks.
- DDR_SDRAM_MODE[AL]changed from 0 to 1.
- DDR_SDRAM_MODE[WRREC] changed from 1 clk to 3 clks.
- DDR_SDRAM_INTERVAL[REFINT] is changed from 0x0320 to 0x0510.
- DDR_SDRAM_INTERVAL[BSTOPRE] is changed from 0x64 to 0x0500.
The patch is based of git://www.denx.de/git/u-boot-mpc83xx.git
The last commit on this tree was 6775c68683
Signed-off-by: Poonam Aggrwal-b10812 <b10812@freescale.com>
Cc: Bill HighSmith <Bill.Highsmith@freescale.com>
Cc: Razzaz Mazyar <MRazzaz@freescale.com>
Cc: Josep P J <PJ.Joseph@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
e1d8ed2c08