set_sdram_scrub_rate
mci->set_sdram_scrub_rate = set_scrub_rate;
mci->set_sdram_scrub_rate = NULL;
mci->set_sdram_scrub_rate = set_sdram_scrub_rate;
new_bw = mci->set_sdram_scrub_rate(mci, bandwidth);
if (mci->set_sdram_scrub_rate)
mci->set_sdram_scrub_rate = i5100_set_scrub_rate;
mci->set_sdram_scrub_rate = set_sdram_scrub_rate;
int (*set_sdram_scrub_rate) (struct mem_ctl_info * mci, u32 bw);