On Tuesday 07 October 2008, Muzammil Ahmed wrote:
I'm using Yosemite board (PPC440EP) for my development with U-Boot firmware version 1.3.4.
Where in source code, I can find code regarding 'initializaiton of SDRAM controller'?
Its the function initdram() in board/amcc/yosemite/yosemite.c. Please note that I'm not referring to v1.3.4 but to the latest version.
Also I recommend not to use this code for a custom board but to use the code available in cpu/ppc4xx/sdram.c. A good example is the p4p440 board support. Depending on the SDRAM configuration you have you only need to configure this (or similar) in your board config header:
#define CONFIG_SDRAM_BANK0 1 /* init onboard DDR SDRAM bank 0*/ #define CFG_SDRAM_TABLE { \ {(256 << 20), 13, 0x000C4001}, /* 256MB mode 3, 13x10(4)*/ \ {(64 << 20), 12, 0x00082001}} /* 64MB mode 2, 12x9(4) */
Also, code regarding 'initialization of EBC'?
The EBC init code is in cpu/ppc4xx/cpu_init.c: cpu_init_f(). But you don't need to change this code for your board but only define the correct CFG_EBC_PBxAB/CR values in your board config header.
Best regards, Stefan
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