[maemo-developers] [maemo-developers] Getting scratchbox CPU transparency working on the n770

[From: Charles 'Buck' Krasic]

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I'm a CPU transparency user too.   I think I hit the same issue back
when 2.0 was originally released.    See the following post for reference:

      http://maemo.org/pipermail/maemo-developers/2006-June/004242.html

Sounds to me like the issue remains the same in 2.1.  I am about to
give it a try with 2.1, so I guess I will see.

- -- Buck

Carl Worth wrote:

> A while back I managed to get scratchbox CPU transparency working
> on a Nokia 770. It's extremely cool voodoo, and very handy.
>
> I just ran through the process again tonight, and took careful
> notes on what I had to do. Some parts of it were a bit painful,
> (and some even got a bit worse than the last time I tried). I've
> attached my notes to myself below, (maybe there's some good wiki
> fodder in here, but I don't know---a lot of it is redundant with
> other more thorough pages scattered about the wiki already).
>
> The question I have is whether some of this couldn't be made much
> simpler in the "standard" latest software editions. In the
> instructions below, I start with an older "Internet Edition 2006"
> install (to get a kernel that works) and then also drop back to a
> "developer" root filesystem to get the check boxes for UsbNet and
> CPU transparency.
>
> This is really handy stuff, but it's a shame to give up all the
> fancy new software on this gadget in order to get at it. How hard
> would it be to be able to add this support to a recent install? For
> example, could that be made just a matter of a couple of extra
> packages?
>
> As for the kernel issues, with the 2.2006.39-14 release I wasn't
> able to get "modprobe nfs" to work. It complained about something
> that made me think depmod needed to be run, but then depmod didn't
> work at all. I didn't explore further at that point but instead
> just dropped back to 1.2006.26-8 since I knew I had gotten this all
> to work at some point in the past.
>
> Anyway, are other people doing things like this? If so, how are you
> going about it? Are you making custom images, etc?
>
> -Carl
>
> First, let's get that n770 into a known state. This requires
> downloading a flasher binary and a software image. The flasher
> binary (for several platforms) is available here:
>
> http://www.maemo.org/downloads/d3.php (With annoying click-through
> license)
>
> I used flasher-2.0, and that may be a requirement.
>
> Next, you'll need an image to flash. Get the following file:
>
> SU-18_2006SE_1.2006.26-8_PR_F5_MR0_ARM.bin from:
> http://www.maemo.org/downloads/nokia_770 (Again, with annoying
> click-through)
>
> Don't be tempted by the newer 2.2006.39-14 release---the kernel it
> comes with doesn't come with the necessary kernel modules.
>
> So, now flash that image by following these steps:
>
> 1. Power off the n770 (hold down the power button on top for a few
> seconds)
>
> 2. Connect it to your host with the provided USB cable
>
> 3. Run the following on your host using the files downloaded above:
>
>
> sudo ./flasher-2.0 -f -R -F
> SU-18_2006SE_1.2006.26-8_PR_F5_MR0_ARM.bin
>
> NOTE: At this point, the command will appear to hang with what
> looks like an error message, ("Suitable USB device not found,
> waiting"). This is normal and expected, just keep going.
>
> 4. Press the power button on the n770 for a second or so.
>
> The flashing should now proceed with progress indicators on both
> sides, and the n770 should reboot when finished. You can now play
> around with the applications installed for a bit, (since the next
> step will wipe them out).
>
> The applications have a lot of polish, but this image doesn't
> include a couple of things we really want, (USB networking, and
> scratchbox CPU transparency), so we're going to install a
> "Developer Image" that misses a lot of applications and polish, but
> lets us get some work done.
>
> So, now download the following:
>
> Maemo_Dev_Platform_v2.1_armel-rootfs.jffs2 from:
> http://www.maemo.org/downloads/d1.php (A third, annoying
> click-through(!))
>
> Then repeat the flashing process, but the details of the flash
> command are different since this is just a root filesystem, not a
> "fiasco" image with kernel, initfs, rootfs, etc. So the steps once
> again are:
>
> 1. Power off n770
>
> 2. Connect it
>
> 3. Run the following command:
>
> sudo ./flasher-2.0 -f -R -r
> Maemo_Dev_Platform_v2.1_armel-rootfs.jffs2
>
> 4. Power on the n770 and watch the flashing proceed
>
> If you had played with the previous software install at all, then
> you'll probably notice a few differences. Such as a big black SDK
> when booting instead of the two hands, a drab gray theme instead of
> the flashy orange stuff, and many fewer applications installed.
>
> But the important difference is a little icon on the top of a
> wrench in front of a blue USB symbol. Click on that and make sure
> that UsbNet is selected rather than MMC and also that the "Enable
> cpu-transparency" option is selected.
>
> From here on out the n770 should be all set. What still needs to be
> done is to setup the following on the host machine:
>
> 1. USB networking scripts
>
> 2. Scratchbox installation
>
> 3. NFS server exports
>
> 4. Scratchbox configuration
>
> And maybe a couple of other things I've forgotten, (though there
> are already a lot of details in just the 4 things above that I
> still need to remind myself.)
>
>
> ----------------------------------------------------------------------
>
>
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> mailing list maemo-developers at maemo.org
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