Re: LZ4 decompression on Boot
Vanessa,
you are of course correct.
I went to the trouble of downloading the latest (r123) LZ4 tools source and
compiled same.
There is indeed an "-l" switch which is only visible when the "long help"
(-H) argument is passed....
I am however, still in the dark as to how I get my kernel
compressed/decompressed (see original post).
Information/documentation as to how to accomplish this on a Debian system is
sparse, to say the least.
Regards,
Andre
En réponse à Vanessa Blöchinger <vanessa.bloechinger@ulukai.org> :
> ------------------ Début du message d'origine --------------------
>
> On 2014-10-30 07:53, Andre Massena wrote:
> > There is no "-l" (streaming) switch available on the r122
> version of LZ4 I
> > am running.
> >
> > I have see the "-l" option mentioned in other (non-Debian)
> forums however.
> >
> >
> > Regards,
> >
> >
> >
> > Andre
>
> This is what i get in jessie's lz4, version 0.0~r122-2:
>
>
> root@jessie:~# lz4 -h
> *** LZ4 Compression CLI 64-bits r122, by Yann Collet (Sep 18
> 2014) ***
>
> [snip]
>
> Advanced arguments :
> -V : display Version number and exit
> -v : verbose mode
> -q : suppress warnings; specify twice to suppress errors
> too
> -c : force write to standard output, even if it is the
> console
> -t : test compressed file integrity
> -l : compress using Legacy format (Linux kernel
> compression)
>
>
> >
> >
> > En réponse à Vanessa Blöchinger
> <vanessa.bloechinger@ulukai.org> :
> >> ------------------ Début du message d'origine
> --------------------
> >>
> >> On 2014-10-29 10:22, Andre Massena wrote:
> >>> Hello all,
> >>>
> >>>
> >>> having trawled through several search engines and perused
> various Debian
> lists, I am still in the dark...
> >>>
> >>> I am running Debian Jessie (Kernel 3.17.1) on a Thinkpad
> X230. I would like
> to use LZ4 to compress/decompress the kernel on booting.
> >>> As per apt-get, the release of liblz4-1 I am running is
> r122-2.
> >>> I have the following kernel settings -
> >>>
> >>> CONFIG_HAVE_KERNEL_LZ4=y
> >>> CONFIG_KERNEL_LZ4=y
> >>> CONFIG_KERNEL_LZ4=y
> >>> CONFIG_ZRAM_LZ4_COMPRESS=y
> >>> CONFIG_CRYPTO_LZ4=y
> >>> CONFIG_CRYPTO_LZ4HC=y
> >>> CONFIG_LZ4_COMPRESS=y
> >>> CONFIG_LZ4HC_COMPRESS=y
> >>> CONFIG_LZ4_DECOMPRESS=y
> >>> CONFIG_DECOMPRESS_LZ4=y
> >>>
> >>> in /etc/initramfs-tools/conf.d I have a file called "lz4"
> which contains the
> line
> >>> COMPRESS=lz4c.
> >>> I subsequently run update-initramfs with the appropriate
> switches and
> reboot.
> >>>
> >>> Result is a "initramfs unpacking failed: junk in compiled
> archive" message
> at boot.
> >>>
> >>> Does anyone have an idea what I might have done
> wrong/incorrect or indeed
> any pointers?
> >>>
> >>>
> >>>
> >>> Regards,
> >>>
> >>>
> >>>
> >>> Andre
> >>>
> >> Hi Andre,
> >>
> >> looks like the kernel is using an older, less standardized
> format for its lz4
> compression. Use the -l switch on lz4c for linux kernel
> support.
> >>
> >> See the lz4 man page and
> >> https://code.google.com/p/lz4/issues/detail?id=66#c2
> >>
> >> Regards
> >> Vanessa
> >>
> >>
> >>
> >> ------------------- Fin du message d'origine
> ---------------------
>
>
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>
> ------------------- Fin du message d'origine ---------------------
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