Many Thanks for the reply. In both the ways you have shown, the eMMC device needs to be zeroed in advance. But so far as I know, writing 4G bytes of zeros and writing 4G bytes of real data has no difference. So this does not solve the problem. Please correct me if I am wrong. Any other options? Thanks Robin --- Andreas Dilger wrote: > If you can wipe the MMC device to be all-zero efficiently, then you can format it quickly with "mke2fs -E lazy_itable_init,lazy_journal_init ..." and restore from a tarball. > > Alternately, Lukas recently added support for QCOW2 sparse image format, and it should be possible to restore this to the device efficiently, if it is zeroed in advance. I don't know if his code skips all-zero blocks in the image, but that should be possible to add fairly easily. > > Cheers, Andreas > > On 2011-07-22, at 9:49 AM, Round Robinjp <roundrobinjp@xxxxxxxxxxx> wrote: > > > Hi > > > > I have a question regarding making ext4 image for > > large eMMC partition. > > > > We have a 4G partition in our embedded device > > in which we want to use ext4 filesystem. > > But for that we have to create a 4G image. > > flashing this 4G image to the eMMC takes a long > > time. Is there any way to reduce this time? > > > > For vfat, you can truncate the image leaving only > > non zero-filled blocks which makes the image very > > short and the time for flashing is reduced. > > Is something similar to that possible for ext4? > > > > Thanks > > Robin -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
