I have got some nice ideas from you.
I summarize them here and add some comments.
o Idea from Andreas
Create minimal image, flash write, then resize2fs
-> Very straight forward idea.
-> Post-processing after flash writing adds some difficulties.
o Idea from Ted
Zero-fill the non-used blocks.
Make the flash writer write only non-zero blocks.
-> Very straight forward idea.
-> Flash writer needs to support this.
o Idea from Amir
Set flex_bg to 32.
Set sparse_super.
Allocate journal from group 0 (feasibility unclear)
Truncate the image.
-> Feasibility and effectiveness is unclear.
-> Good side is legacy flash writer can be used.
o Idea from Yongqiang
Delete journal before flash write and later add it back.
-> Post-processing after flash writing adds some difficulties.
I will examine all of these to find out a suitable solution.
Thanks
Round
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