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On 26-06-2010 01:42, jesse@×××××××××××××.com wrote: |
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> On Sat, 26 Jun 2010 01:36 +0200, "Angelo Arrifano" <miknix@g.o> |
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> wrote: |
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>> On 26-06-2010 01:00, jesse@×××××××××××××.com wrote: |
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>>> Howdy. I'd like to know how Gentoo devs build the files in Code Listing |
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>>> 3.6 in http://dev.gentoo.org/~armin76/arm/sheevaplug/install.xml ? I'd |
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>>> like to build those files myself, and would love to see your recipe, |
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>>> even if it's very rough. I'm especially interested in what tools you |
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>>> used. Thanks. |
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>> |
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>> * uImage_kwplug is just Linux - the kernel. The sources are mainly |
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>> available on kernel.org. You need a cross compiler to build them for |
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>> this particular Marvell CPU. Look on Gentoo documentation how to build a |
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>> cross compiler and how to compile the kernel. |
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>> |
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>> * sheevaplug.initramfs - This is just the bootable userspace. Since we |
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>> are at Gentoo, I guess it was produced using our cross-compiler |
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>> toolchain which is embedded in the Gentoo's package manager. Look on our |
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>> documentation how to build a cross compiler and cross compile with |
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>> emerge. |
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>> |
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>> Keywords: crossdev, emerge, cross root compilation, cross compile kernel |
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>> |
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>> There are no secrets, everything is widely available |
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>> Have fun ;) |
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>>> |
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>>> Cheers, |
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>>> Jesse Adelman |
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>>> San Francisco, CA |
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>>> |
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>> |
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>> |
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> |
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> Thanks, Angelo. I should have been more specific, and narrow. :) I'm |
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> really interested in the initramfs generation. I've got a ARM toolchain |
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> configured (yay qemu-arm and distcc... takes about 48 hours to |
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> emptytree-build a stripped-down userspace given my resources), and have |
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> a chrooted ARM rootfs made, but I'm curious how it was made into an |
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> "initramfs". |
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|
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A initramfs is just a cpio archive of your rootfs. You will have to take |
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special attention to the init process and what init will spawn. Also |
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take care of required virtual filesystems like proc, and make available |
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required devices nodes like console and ttys. |
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|
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Again, Google for "make initramfs". I came up with this one: |
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http://en.gentoo-wiki.com/wiki/Initramfs |
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|
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If UBoot supports it, you can also try to create an initrd. You can |
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produce compressed initrds using several tools like mkcramfs, mksquashfs |
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etc.. |
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|
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> My plan is to have boot into an SD Card on the sheevaplugs |
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> and guruplugs, but booting the rootfs from tftp like the docs do would |
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> make for easier testing. |
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|
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Just configure your initramfs/initrd to mount the SD card and then |
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pivot_root into the SD card. There are plenty of examples on the |
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internet, specially with busybox. |
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|
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Regards, |
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> |
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> Cheers, |
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> Jesse Adelman |
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> San Francisco, CA |
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