[U-Boot] [PATCH 1/2] fit: Support FDT compression

Simon Goldschmidt simon.k.r.goldschmidt at gmail.com
Thu Apr 18 20:06:48 UTC 2019

On 18.04.19 21:59, Julius Werner wrote:
> Hi Simon,
> Is your approach similar to what I did here (decompressing
> transparently as part of fit_image_load())? I think I could easily
> expand this to other image types, I just don't always know how to test
> those. Really, the only thing that can't be decompressed there is the
> kernel image (because that is done later), so rather than checking for
> IH_TYPE_FLATDT I could check for !(IH_TYPE_KERNEL ||

My approach was to uncompress all compressed images on-the-fly in 
fit_image_load(). I also hadn't fixed the kernel issue, so maybe 
deferring uncompression of kernel would be a good enough fix.

We had discussed that back then (around october'18) and I think we got 
to the point that it would be OK to use the "compressed" flag as a hint 
for U-Boot to uncompress things (meaning that a compressed initrd that 
should be passed to kernel compressed should not have the "compressed" 
flag in the FIT).

> Alternatively, maybe we could take this as a first step and it can
> later be expanded to support other types when someone has time to work
> on that?

Or I could dig up my patches from October and we'll see how far you get 
with those?


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