To SD, there is no erase group, then the value erase_grp_size will be default 1. When erasing SD blocks, the blocks will be erased one by one, which is time consuming.
We use AU_SIZE as a group to speed up the erasing. Erasing 4MB with a SD2.0 Card with AU_SIZE 4MB. `time mmc erase 0x100000 0x2000` time: 44.856 seconds (before optimization) time: 0.335 seconds (after optimization) Signed-off-by: Peng Fan <peng....@nxp.com> Cc: Jaehoon Chung <jh80.ch...@samsung.com> Cc: Simon Glass <s...@chromium.org> Cc: Bin Meng <bmeng...@gmail.com> Cc: Stefan Wahren <stefan.wah...@i2se.com> Cc: Clemens Gruber <clemens.gru...@pqgruber.com> Cc: Kever Yang <kever.y...@rock-chips.com> Cc: Eric Nelson <e...@nelint.com> Cc: Stephen Warren <swar...@nvidia.com> --- V2: Add more commit log drivers/mmc/mmc_write.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c index 3589f8e..6221b4a 100644 --- a/drivers/mmc/mmc_write.c +++ b/drivers/mmc/mmc_write.c @@ -129,8 +129,13 @@ unsigned long mmc_berase(struct blk_desc *block_dev, lbaint_t start, & ~(mmc->erase_grp_size - 1)) - 1); while (blk < blkcnt) { - blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ? - mmc->erase_grp_size : (blkcnt - blk); + if (IS_SD(mmc) && mmc->ssr.au) { + blk_r = ((blkcnt - blk) > mmc->ssr.au) ? + mmc->ssr.au : (blkcnt - blk); + } else { + blk_r = ((blkcnt - blk) > mmc->erase_grp_size) ? + mmc->erase_grp_size : (blkcnt - blk); + } err = mmc_erase_t(mmc, start + blk, blk_r); if (err) break; -- 2.6.2 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot