How to enable ECC check in Linux runing on powerpc P1020?

[oska874]

As topic says,I'm running a embedded linux(provideded by the develop board,that made by Yocto) on P1020.I need the ecc checking of P1020.So I try to mmap ddr's control register and modify the value of reigister DDR_SDRAM_CFG. But I failed.I can mmap ddr controllor's registers only with PROT_READ permission while other registers such as PVR can be mmap as PROT_READ|PROT_WRITE.Only if I mmap ddr's controllor reigister with PROT_WRITE permission,then linux will stop running .

So how can i enable ecc check under linux running p1020??

thansk very much.

[yipingwang]

In order to enable DDR ECC, please enable register DDR_SDRAM_CFG[ECC_ON] and DDR_SDRAM_CFG_2[D_INIT], please modify the configuration in u-boot, because DDR is initialized in u-boot.

Please refer to the "Default settings for DDR3" section in include/configs/p1_p2_rdb_pc.h

Have a great day,
Yiping Wang

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