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aboot unzip "unknown compression method" on recent (post 6.4) kernels?



Hi,

    I have been unable to boot kernels after 6.4; aboot fails with "unzip: unknown compression method". Specifically:

        - vmlinuz-6.4.0-1-alpha-generic --> works
        - vmlinuz-6.6.15-alpha-generic --> fails
        - vmlinuz-6.11.6-alpha-generic --> fails

    This is on a XP1000 (EV67/Tsunami/Monet). aboot is 1.0~pre20200212-1. FWIW, "gzip -l --verbose" says all kernels are compressed with the same method:

$gzip -l --verbose vmlinuz-6*
method  crc     date  time           compressed uncompressed  ratio uncompressed_name defla 2ad47e09 Nov  4 13:57             7010635 24244720  71.1% vmlinuz-6.11.6-alpha-generic defla 148fa7ac Jul 22 23:53             6814008 23614088  71.1% vmlinuz-6.4.0-1-alpha-generic defla 30836626 Feb  4 12:28             7045662 24145360  70.8% vmlinuz-6.6.15-alpha-generic

    Did something more subtle change in compression in between kernel 6.4 and 6.6?

                    Thanks,

                    -Alex



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