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075d0b81e8
Alternate SDRAM DDR autocalibration routine that can be generically used for any PPC4xx chips that have the IBM SDRAM Controller core allowing for support of more DIMM/memory chip vendors and gets the DDR autocalibration values which give the best read latency performance (SDRAM0_RDCC.[RDSS]). Two alternate SDRAM DDR autocalibration algoritm are provided in this patch, "Method_A" and "Method_B". DDR autocalibration Method_A scans the full range of possible PPC4xx SDRAM Controller DDR autocalibration values and takes a lot longer to run than Method_B. Method_B executes in the same amount of time as the currently existing DDR autocalibration routine, i.e. 1 second or so. Normally Method_B is used and it is set as the default method. The current U-Boot PPC4xx DDR autocalibration code calibrates the IBM SDRAM Controller registers.[bit-field]: 1) SDRAM0_RQDC.[RQFD] 2) SDRAM0_RFDC.[RFFD] This alternate PPC4xx DDR autocalibration code calibrates the following IBM SDRAM Controller registers.[bit-field]: 1) SDRAM0_WRDTR.[WDTR] 2) SDRAM0_CLKTR.[CKTR] 3) SDRAM0_RQDC.[RQFD] 4) SDRAM0_RFDC.[RFFD] and will also use the calibrated settings of the above four registers that produce the best "Read Sample Cycle Select" value in the SDRAM0_RDCC.[RDSS] register.[bit-field]. Signed-off-by: Adam Graham <agraham@amcc.com> Signed-off-by: Stefan Roese <sr@denx.de> |
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| .. | ||
| 4xx_enet.c | ||
| 4xx_ibm_ddr2_autocalib.c | ||
| 4xx_pci.c | ||
| 4xx_pcie.c | ||
| 4xx_uart.c | ||
| 40x_spd_sdram.c | ||
| 44x_spd_ddr.c | ||
| 44x_spd_ddr2.c | ||
| bedbug_405.c | ||
| cache.S | ||
| commproc.c | ||
| config.mk | ||
| cpu.c | ||
| cpu_init.c | ||
| dcr.S | ||
| denali_data_eye.c | ||
| denali_spd_ddr2.c | ||
| ecc.c | ||
| ecc.h | ||
| fdt.c | ||
| gpio.c | ||
| i2c.c | ||
| interrupts.c | ||
| iop480_uart.c | ||
| kgdb.S | ||
| Makefile | ||
| miiphy.c | ||
| ndfc.c | ||
| resetvec.S | ||
| sdram.c | ||
| sdram.h | ||
| speed.c | ||
| start.S | ||
| tlb.c | ||
| traps.c | ||
| uic.c | ||
| usb.c | ||
| usb_ohci.c | ||
| usb_ohci.h | ||
| usbdev.c | ||
| usbdev.h | ||
| xilinx_irq.c | ||