powerpc/c29xpcie: add DDR ECC on off config setting
c29xpcie REV_A board DDR ECC chip has bad impedance in hardware, force that kind of board to be DDR ECC off when booting. Other version board config ECC on/off by hwconfig=fsl_ddr:ecc=on in uboot enviroment. Signed-off-by: NPo Liu <Po.Liu@freescale.com> Acked-by: NYork Sun <yorksun@freescale.com>
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