Hi!
Working on an imx6ull based board.
We are creating a custom image in yocto where we have a rather large but empty partition (ext4 filesystem created in this partition but no data).
Downloading the resulting image takes about 10 minutes but we need to reduce this time.
So far we have used:
uuu -b emmc_all <path to u-boot> <path to .wic.bz2 file>/*
Looking at the the decompressed .wic file it is about 3.6 G but most of this should be zeros/empty space.
I think one can draw this conclusion also looking at the generated rootfs.wic.bmap-file as it states:
<!-- Image size in bytes: 3.5 GiB -->
<ImageSize> 3790602240 </ImageSize>
<!-- Size of a block in bytes -->
<BlockSize> 4096 </BlockSize>
<!-- Count of blocks in the image file -->
<BlocksCount> 925440 </BlocksCount>
<!-- Count of mapped blocks: 514.2 MiB or 14.2% -->
<MappedBlocksCount> 131631 </MappedBlocksCount>
Also tried to convert the .wic file using android's img2simg.
When trying the resulting file using the inbuild "emmc_all" script the bootloader started (booting from bootpartition?) but couldn't find a partition table.
Have also made various attempts using a custom uuu-script based on the "emmc_all" inbuilt scipt.
Is there some way to do a "sparse flashing" using uuu?
And could someone point me to how to do this?
thanks,
Mårten
