On Sun, Feb 05, 2012 at 03:11:48PM +0100, Samuel Thibault wrote: > Bastian Blank, le Sun 05 Feb 2012 14:55:49 +0100, a écrit : > > On Sun, Feb 05, 2012 at 02:09:11PM +0100, Samuel Thibault wrote: > > > AIUI, linux can now have support for uncompressing bzip2, lzma and lzo. > > > > CONFIG_RD_GZIP=y > > CONFIG_RD_BZIP2=y > > CONFIG_RD_LZMA=y > > CONFIG_RD_XZ=y > > CONFIG_RD_LZO=y > > > > The amd64 image have support for gzip, bzip2, lzma and the xz variant. > > Ah, right, it's not explicitly set in the linux-2.6 configs, but > automatically enabled by Kconfig. > > So, anything against using xz compression instead? (except that there > might be quite a few scripts to update from initrd.gz to initrd.xz...)
Samuel, thanks a lot for all ideas. Using xz on the sparc's netboot initrd image reduces its size dramatically: -rw-r--r-- 1 jurij jurij 4341553 Feb 17 18:50 initrd.gz -rw-r--r-- 1 jurij jurij 3083408 Feb 17 18:51 initrd.xz Attached patch implements the switch. It's not particularly elegant, but minimally intrusive, only affecting the building ot sparc's netboot image. I would like to commit it some time next week, unless anyone objects. Best regards, -- Jurij Smakov ju...@wooyd.org Key: http://www.wooyd.org/pgpkey/ KeyID: C99E03CC
>From 821362eaaba0982132ad2ed54c9aff4be01eee38 Mon Sep 17 00:00:00 2001 From: Jurij Smakov <ju...@wooyd.org> Date: Fri, 17 Feb 2012 19:07:45 +0000 Subject: [PATCH] Switch sparc netboot image to xz-compressed initrd to get its size under the magic limit of 10MB (otherwise it does not boot). --- build/config/sparc/netboot.cfg | 10 ++++++++-- debian/control | 4 +++- 2 files changed, 11 insertions(+), 3 deletions(-) diff --git a/build/config/sparc/netboot.cfg b/build/config/sparc/netboot.cfg index 23b3b46..828ce73 100644 --- a/build/config/sparc/netboot.cfg +++ b/build/config/sparc/netboot.cfg @@ -7,7 +7,13 @@ EXTRANAME = $(MEDIUM)/ MANIFEST-BOOT = "tftp boot image for sparc64" +TEMP_INITRD_XZ = $(TEMP)/initrd.xz + +$(TEMP_INITRD_XZ): $(TEMP_INITRD) + # xz options ensure that kernel's decoder can handle the image. + zcat $(TEMP_INITRD) | xz --check=crc32 --lzma2=dict=512KiB > $(TEMP_INITRD_XZ) + .PHONY: arch_boot -arch_boot: +arch_boot: $(TEMP_INITRD_XZ) gzip -c $(TEMP)/System.map-$(KERNELIMAGEVERSION) >$(TEMP)/System.map.gz - tftpboot.sh $(TEMP_KERNEL) $(TEMP)/System.map.gz $(TEMP_INITRD) $(TEMP_BOOT) + tftpboot.sh $(TEMP_KERNEL) $(TEMP)/System.map.gz $(TEMP_INITRD_XZ) $(TEMP_BOOT) diff --git a/debian/control b/debian/control index 5eef76a..949e14b 100644 --- a/debian/control +++ b/debian/control @@ -1,4 +1,4 @@ -Source: debian-installer +source: debian-installer Section: devel Priority: optional Maintainer: Debian Install System Team <debian-boot@lists.debian.org> @@ -78,6 +78,8 @@ Build-Depends: # m68k uses it for atari floppies cpio, # For creating initramfs images. + xz-utils, +# For compressing initramfs images. devio [armeb armel], # Tool to read and write from block devices, used to byteswap # kernels and add nslu2 boot magic. -- 1.7.9
