armin76 at gentoo
Jun 29, 2010, 11:05 AM
Post #6 of 6
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Re: "Gentoo on the Marvell Sheevaplug" Code Listing 3.6 question
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On 06/26/2010 02:35 AM, jesse [at] boldandbusted wrote:
> On Sat, 26 Jun 2010 02:01 +0200, "Angelo Arrifano" <miknix [at] gentoo>
> wrote:
>> On 26-06-2010 01:42, jesse [at] boldandbusted wrote:
>>> On Sat, 26 Jun 2010 01:36 +0200, "Angelo Arrifano" <miknix [at] gentoo>
>>> wrote:
>>>> On 26-06-2010 01:00, jesse [at] boldandbusted wrote:
>>>>> Howdy. I'd like to know how Gentoo devs build the files in Code Listing
>>>>> 3.6 in http://dev.gentoo.org/~armin76/arm/sheevaplug/install.xml ? I'd
>>>>> like to build those files myself, and would love to see your recipe,
>>>>> even if it's very rough. I'm especially interested in what tools you
>>>>> used. Thanks.
>>>>
>>>> * uImage_kwplug is just Linux - the kernel. The sources are mainly
>>>> available on kernel.org. You need a cross compiler to build them for
>>>> this particular Marvell CPU. Look on Gentoo documentation how to build a
>>>> cross compiler and how to compile the kernel.
>>>>
>>>> * sheevaplug.initramfs - This is just the bootable userspace. Since we
>>>> are at Gentoo, I guess it was produced using our cross-compiler
>>>> toolchain which is embedded in the Gentoo's package manager. Look on our
>>>> documentation how to build a cross compiler and cross compile with
>>>> emerge.
>>>>
>>>> Keywords: crossdev, emerge, cross root compilation, cross compile kernel
>>>>
>>>> There are no secrets, everything is widely available
>>>> Have fun ;)
>>>>>
>>>>> Cheers,
>>>>> Jesse Adelman
>>>>> San Francisco, CA
>>>>>
>>>>
>>>>
>>>
>>> Thanks, Angelo. I should have been more specific, and narrow. :) I'm
>>> really interested in the initramfs generation. I've got a ARM toolchain
>>> configured (yay qemu-arm and distcc... takes about 48 hours to
>>> emptytree-build a stripped-down userspace given my resources), and have
>>> a chrooted ARM rootfs made, but I'm curious how it was made into an
>>> "initramfs".
>>
>> A initramfs is just a cpio archive of your rootfs. You will have to take
>> special attention to the init process and what init will spawn. Also
>> take care of required virtual filesystems like proc, and make available
>> required devices nodes like console and ttys.
>>
>> Again, Google for "make initramfs". I came up with this one:
>> http://en.gentoo-wiki.com/wiki/Initramfs
>>
>> If UBoot supports it, you can also try to create an initrd. You can
>> produce compressed initrds using several tools like mkcramfs, mksquashfs
>> etc..
>>
>>> My plan is to have boot into an SD Card on the sheevaplugs
>>> and guruplugs, but booting the rootfs from tftp like the docs do would
>>> make for easier testing.
>>
>> Just configure your initramfs/initrd to mount the SD card and then
>> pivot_root into the SD card. There are plenty of examples on the
>> internet, specially with busybox.
>>
>> Regards,
>>>
>>> Cheers,
>>> Jesse Adelman
>>> San Francisco, CA
>>
>>
>
> So, you-all don't use dracut or mkinitrd? Just a list of commands used
> to build the stuff you put up for download would be great. Thanks.
>
Hi Jesse,
For creating the initramfs i simply used catalyst, which is the Gentoo
Release tool. Can't tell you much about the process, since its kinda of
automated.
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