ar9003_aic_find_valid
start_idx = ar9003_aic_find_valid(cal_sram_valid, 0, i);
end_idx = ar9003_aic_find_valid(cal_sram_valid, 1, i);
end_idx = ar9003_aic_find_valid(cal_sram_valid, 1, start_idx);
end_idx = ar9003_aic_find_valid(cal_sram_valid, 0, start_idx);
i = ar9003_aic_find_valid(cal_sram_valid, 1, 0);