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authorPoonam Aggrwal <b10812@freescale.com>2008-01-14 09:41:14 +0530
committerKim Phillips <kim.phillips@freescale.com>2008-01-16 12:00:49 -0600
commite1d8ed2c08da14b168658cc5fa78529d461aea70 (patch)
tree941ab24acee735ca97acdcb04e6fa7a66c28c797 /board/freescale/mpc8349itx
parentb5cdd7df4a06edb91539c9a2ea7c178a870c3a95 (diff)
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Changes in uboot DDR configuration for MPC8313eRDB
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 6775c68683a53c7abc778774641aac6f833a2cbf 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>
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