AM335x Champs,
In the function config_ddr() in arch/arm/cpu/armv7/am33xx/emif4.c there is a call to board_is_evm_15_or_later(), see:
void config_ddr(short ddr_type)
{
int ddr_pll, ioctrl_val;
const struct emif_regs *emif_regs;
const struct ddr_data *ddr_data;
const struct cmd_control *cmd_ctrl_data;
if (ddr_type == EMIF_REG_SDRAM_TYPE_DDR2) {
ddr_pll = 266;
cmd_ctrl_data = &ddr2_cmd_ctrl_data;
ddr_data = &ddr2_data;
ioctrl_val = DDR2_IOCTRL_VALUE;
emif_regs = &ddr2_emif_reg_data;
} else if (ddr_type == EMIF_REG_SDRAM_TYPE_DDR3) {
ddr_pll = 303;
ioctrl_val = DDR3_IOCTRL_VALUE;
cmd_ctrl_data = &ddr3_cmd_ctrl_data;
if (board_is_evm_15_or_later()) {
ddr_data = &ddr3_evm_data;
emif_regs = &ddr3_evm_emif_reg_data;
} else {
ddr_data = &ddr3_data;
emif_regs = &ddr3_emif_reg_data;
}
} else {
puts("Unknown memory type");
hang();
}
Our board uses DDR3, should we be emulating the EVM 1.5 or later, or the earlier model?
What is the difference between these two modes?
