+set IXP42x_SDRAM_8MB_2Mx32_1BANK 0x0030
+set IXP42x_SDRAM_16MB_2Mx32_2BANK 0x0031
+set IXP42x_SDRAM_16MB_4Mx16_1BANK 0x0032
+set IXP42x_SDRAM_32MB_4Mx16_2BANK 0x0033
+set IXP42x_SDRAM_32MB_8Mx16_1BANK 0x0010
+set IXP42x_SDRAM_64MB_8Mx16_2BANK 0x0011
+set IXP42x_SDRAM_64MB_16Mx16_1BANK 0x0012
+set IXP42x_SDRAM_128MB_16Mx16_2BANK 0x0013
+set IXP42x_SDRAM_128MB_32Mx16_1BANK 0x0014
+set IXP42x_SDRAM_256MB_32Mx16_2BANK 0x0015
+
+
+# helper function to init SDRAM on IXP42x.
+# SDRAM_CFG: one of IXP42X_SDRAM_xxx
+# REFRESH: refresh counter reload value (integer)
+# CASLAT: 2 or 3
+proc ixp42x_init_sdram { SDRAM_CFG REFRESH CASLAT } {
+
+ switch $CASLAT {
+ 2 {
+ set SDRAM_CFG [expr {$SDRAM_CFG | $::IXP42x_SDRAM_CL2} ]
+ set CASCMD $::IXP425_SDRAM_IR_MODE_SET_CAS2_CMD
+ }
+ 3 {
+ set SDRAM_CFG [expr {$SDRAM_CFG | $::IXP42x_SDRAM_CL3} ]
+ set CASCMD $::IXP425_SDRAM_IR_MODE_SET_CAS3_CMD
+ }
+ default { error [format "unsupported cas latency \"%s\" " $CASLAT] }
+ }
+ echo [format "\tIXP42x SDRAM Config: 0x%x, Refresh %d " $SDRAM_CFG $REFRESH]
+
+ mww 0xCC000000 $SDRAM_CFG ;# SDRAM_CFG: 0x2A: 64MBit, CL3
+ mww 0xCC000004 0 ;# disable refresh
+ mww 0xCC000008 3 ;# NOP
+ sleep 100
+ mww 0xCC000004 $REFRESH ;# set refresh counter
+ mww 0xCC000008 2 ;# Precharge All Banks
+ sleep 100
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 4 ;# Auto Refresh
+ mww 0xCC000008 $CASCMD ;# Mode Select CL2/CL3
+}
+
+proc ixp42x_set_bigendian { } {
+ reg XSCALE_CTRL 0xF8
+}