| 1 |
Hi Leho! |
| 2 |
Thanks for many links, Jude Pereira's work totally missed my search results. |
| 3 |
|
| 4 |
In fact I focused on playing with Qemu. First approach was to emulate whole |
| 5 |
board (using qemu-system-arm) which works so far best of all, but is |
| 6 |
painfully slow (but not more than other options). As for chrooted |
| 7 |
environment, I used armv5tel stage3 tarballs available at my university |
| 8 |
site: |
| 9 |
http://ftp.fi.muni.cz/pub/linux/gentoo/releases/arm/autobuilds/current-stage3-armv5tel/- |
| 10 |
it is one of official gentoo mirrors and stage3 tarball contains |
| 11 |
everything necessary already compiled, including fully operational perl |
| 12 |
5.12.3. I had no problems emerging any other packages, but as I said, |
| 13 |
compilation takes ages. |
| 14 |
|
| 15 |
Then I tried to move contents of my emulated folder to my ARM target machine |
| 16 |
and on the machine try to chroot inside it. No problem with |
| 17 |
compiling/emerging in chrooted environment directly on target machine, but |
| 18 |
speed is maybe even lower. |
| 19 |
|
| 20 |
The last approach I tried was using binfmt support to be able to run arm |
| 21 |
binaries on my x64 box without the necessity to emulate whole board - I |
| 22 |
hoped to have much better performance than when using qemu-system-arm. |
| 23 |
Unfortunately it seems that qemu-arm does not support some system calls or |
| 24 |
whatever. I untared stage3 on my x64 machine, chrooted into the folder and |
| 25 |
tried running emerge - simple arm binaries were running fine, but emerge |
| 26 |
ended with errors like "qemu: Unsupported syscall: 242"... |
| 27 |
|
| 28 |
And last of all, I started documenting my approach on google sites: |
| 29 |
https://sites.google.com/site/czernitko/cross-compilation/cross-compiling-perl-for-arm-architecture |
| 30 |
|
| 31 |
Peter |
| 32 |
|
| 33 |
2011/10/16 Leho Kraav <leho@×××××.com> |
| 34 |
|
| 35 |
> i have managed to cross-compile a pretty complete stage3 for arm i believe |
| 36 |
> with perl-5.10.1 from |
| 37 |
> http://git.overlays.gentoo.org/gitweb/?p=proj/embedded-cross.git;a=tree;f=dev-lang/perl |
| 38 |
> |
| 39 |
> overall the cross-compile experience was a nightmare, esp. re perl and |
| 40 |
> python. many packages obscurely fail, but not enough for you to immediately |
| 41 |
> give up. so it keeps sucking you back in and waste even more time. at the |
| 42 |
> time i discovered that embedded-cross overlay had mostly done all the |
| 43 |
> difficult work for me, but it seems it is no longer updated for recent |
| 44 |
> stuff. i think guys in #gentoo-embedded told me it is a lot of effort to |
| 45 |
> patch these large packages like perl and python to sanely cross-compile, and |
| 46 |
> since i think their product thing didn't work out too well, they weren't |
| 47 |
> going to sink any more time into maintaining for newer versions. |
| 48 |
> |
| 49 |
> but jude pereira i believe is doing something with arm stages at least |
| 50 |
> semi-actively |
| 51 |
> http://judepereira.com/blog/gentoo-linux-uclibc-stage3-2010-for-embedded/and it is definitely a lot of fun booting pretty much full blown gentoo on |
| 52 |
> things like Nokia N8x0 internet tablets |
| 53 |
> https://github.com/slonopotamus/n8x0-overlay |
| 54 |
> |
| 55 |
> |
Archives