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musv
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Joined: 01 Dec 2002
Posts: 3366
Location: de
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 Posted: Sat Aug 20, 2016 6:04 pm Post subject: [solved] qemu-arm in chroot: emerge doesn't start |
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Hi!
With some trouble and a lot of learning I got the chroot for arm running using this guide. I created with qemu-img a disk container, unpacked the arm stage3 tarball into it and mounted this container to /usr/armv7a-hardfloat-linux-gnueabi. After installing qemu-arm (static) to the root path of this environment and starting binfmt I tried to compile the system.
| emerge -1u ncurses: |
* IMPORTANT: 10 news items need reading for repository 'gentoo'.
* Use eselect news read to view new items.
Calculating dependencies... done!
The following packages are causing rebuilds:
(sys-libs/ncurses-6.0-r1:0/6::gentoo, ebuild scheduled for merge) causes rebuilds for:
(sys-apps/util-linux-2.28:0/0::gentoo, ebuild scheduled for merge)
(app-editors/nano-2.6.1:0/0::gentoo, ebuild scheduled for merge)
(sys-apps/openrc-0.21.3:0/0::gentoo, ebuild scheduled for merge)
(sys-apps/less-483-r1:0/0::gentoo, ebuild scheduled for merge)
(net-firewall/iptables-1.6.0:0/11::gentoo, ebuild scheduled for merge) causes rebuilds for:
(sys-apps/iproute2-4.6.0:0/0::gentoo, ebuild scheduled for merge) |
And at this point it hangs. Qemu-arm runs with 100% of cpu-last on one core. Even if I let it working for a couple of hours, nothing changes.
My make.conf:
| Code: | # CPU: 88F6810 http://www.marvell.com/embedded-processors/armada-38x/
# CPU: ARMv7 Cortex-A9 Single Core with NEON
# cpuinfo: ARMv7 Processor rev 1 (v7l)
# Features: swp half thumb fastmult vfp edsp neon vfpv3 tls
# Ethernet: 2 x 1/2.5G bE
# PCIe: 3x PCIe 2.0 x1
# USB: 2x USB3, 1x USB2
# UART: 2x
# SATA: 2x SATA3
# Device Bus: 8/16 bit Device bus
# https://community.arm.com/groups/tools/blog/2013/04/15/arm-cortex-a-processors-and-gcc-command-lines
# Auto-Vectorizer: nur mit -O3 oder -Ofast (enthält -O3)
# aapcs=ABI standard
# keine Virtualisierung
# Architektur: armv7-a = Cortex-a9
#CFLAGS="-Ofast -march=armv7-a -mtune=cortex-a9 -pipe -fomit-frame-pointer"
CFLAGS="-Ofast -march=armv7-a -mtune=cortex-a9 -mfpu=neon-fp16 -mfloat-abi=hard -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"
CHOST=armv7a-hardfloat-linux-gnueabi
ACCEPT_KEYWORDS="arm ~arm"
MAKEOPTS="-j13"
#EMERGE_DEFAULT_OPTS="--jobs=12 --load-average=12"
# /var/tmp/portage
PORTAGE_TMPDIR=/var/tmp/
# Distfiles-Directory
DISTDIR=/var/portage/distfiles
# Binaries
PKGDIR=${PORTDIR}/packages
AUTOCLEAN="yes"
FEATURES="-collision-protect sandbox buildpkg noman noinfo nodoc"
PORTAGE_NICENESS="3"
USE="${ARCH} -pam -acl -avahi -consolekit -cracklib -cron -dso -dv -emboss -fam -firefox -gdbm -gnome -ipv6 -ldap -libav -libcanberra -modemmanager -pm-utils -pulseaudio -qt-static -vlc -kde"
GENTOO_MIRRORS="http://mirrors.sec.informatik.tu-darmstadt.de/gentoo/ http://gentoo.mneisen.org/ http://de-mirror.org/distro/gentoo/ http://gentoo.supp.name/ http://gentoo.krasko.sk/"
############### Zeug aus Cross-Compiling-Umgebung ##########
#CBUILD=x86_64-pc-linux-gnu
#ARCH="arm"
#
#HOSTCC=x86_64-pc-linux-gnu-gcc
#
#ROOT=/usr/${CHOST}/
#CCFULL=/usr/x86_64-pc-linux-gnu/armv7a-hardfloat-linux-gnueabi/gcc-bin/4.9.3/armv7a-hardfloat-linux-gnueabi-gcc
##CCFULL=/usr/x86_64-pc-linux-gnu/armv7a-hardfloat-linux-gnueabi/gcc-bin/5.4.0/armv7a-hardfloat-linux-gnueabi-gcc
#CC=${CCFULL}-gcc
#CXX=${CCFULL}-g++
#######################################
# Be sure we dont overwrite pkgs from another repo..
PKGDIR=${ROOT}packages/
ELIBC="glibc"
PKG_CONFIG_PATH="${ROOT}usr/lib/pkgconfig/"
#PORTDIR_OVERLAY="/usr/portage/local/" |
Is there something misconfigured in my make.conf?
Last edited by musv on Sun Aug 21, 2016 9:28 am; edited 1 time in total |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54615
Location: 56N 3W
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| Posted: Sat Aug 20, 2016 6:20 pm Post subject: |
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musv,
100% of one core is running the arm CPU emulator.
I suspect qemu-arm only emulates a single arm core. Look in /proc/cpuinfo.
Your emulated CPU BOGOmips may make your eyes water too.
Compare it to the target system.
should be but its not building anything yet.
Allowing for the number of emulated cores you have and the BOGOmips drop, you can make a guess at how slow it will be.
In my experience 100% of a 3.4GHz core got me a 200MHz SPARC.
There is no reason to expect arm to be any better.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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musv
Advocate
Joined: 01 Dec 2002
Posts: 3366
Location: de
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| Posted: Sun Aug 21, 2016 9:27 am Post subject: |
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| Quote: | | I suspect qemu-arm only emulates a single arm core. |
Yes and no. Found out, if you have MAKEOPTS higher than one, then there are multiple qemu-arm processes.
But the problem was something different.
My idea was:
- inside chroot just call: emerge foo bar
- cross-compile from outside: ROOT=/usr/arm... CHOST=... armv7a-hardfloat-linux-gnueabi-emerge foo bar
This isn't working. For some reason I don't understand yet, emerge fails in this way and keeps hanging. Instead you need to set the full cross-compile environment in the chroot make.conf and modify some stuff if you want to compile inside the chroot. More clearly:
- inside chroot: ROOT=/ CC=armv7a-hardfloat-linux-gnueabi-gcc CXX=armv7a-hardfloat-linux-gnueabi-g++ emerge foo bar
- cross-compile from outside: armv7a-hardfloat-linux-gnueabi-emerge foo bar
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