[okl4-developer] Booting N810

[Geoffrey Lee]

On Tue, Jun 17, 2008 at 12:37:37AM -0400, Ashish Bijlani wrote:
> Hi Josh,
> 
> I cannot flash uboot onto the device coz it doesn't have any serial
> port open. nokia advices not to play with the serial port. the flasher
> and nokia loader are indeed not open source. however, there is an
> equivalent open source user level flasher
> (http://www.nopcode.org/0xFFFF/) available that has support for n810.
> even if i choose to to add support for flashing uboot in this open
> source flasher, it won't work coz this flasher is just a client side
> utility to talk to the NOLO, which is the 'server-side' part of the
> flasher from Nokia. It is composed of two pieces which are not open
> source.
> 
> is there any other way? can't okl4 produce zImage of the final elf and
> use gz/inflate/deflate compression/decompression method (like linux)
> to decompress the final image.boot/image.elf on the fly? is it hard to
> do this? pls lemme know. thanks.


You can create a binary bootable image for loaders which do not
support ELF loading.  We do this for our KZM board.  This is done by 
using the objcopy(1) command to convert the image.boot
file, which you normally would use to boot, to a binary image.
The output target is specified by using passing -O binary.
You can get the build system to do this for you, specify 
boot_binary = True in the machines.py platform description.

To boot using this method, you load the binary file into RAM starting
at some address, then get the bootloader to start execution at that address.

> 
> -Ashish

	-gl

> 
> On Mon, Jun 16, 2008 at 11:33 PM, Josh Matthews <jmatthews at ok-labs.com> wrote:
> > Hi Ashish,
> >
> > On Tue, Jun 17, 2008 at 12:43 AM, Ashish Bijlani <ashish.bijlani at gmail.com>
> > wrote:
> >>
> >> I'm trying to boot okl4 on n810. However, okl4 produces
> >> image.elf/image.boot and the flasher on n810 needs an zImage. How do I
> >> convert the image.elf/image.boot into an equivalent zImage.
> >
> > From my understanding, the flasher and loader (NOLO) for the N810 are
> > linux-specific (the FIASCO blob contains loader,  linux kernel, initfs,
> > rootfs).
> >
> > I'd suggest the best way to get up and running quickly is to load U-Boot
> > onto the device. U-Boot is well supported on the OMAP2420 - check out
> > https://agora.cs.uiuc.edu/display/SRG/OMAP2420+Software+Development+Platform+Bringup.
> >
> > Best regards,
> >
> > Josh Matthews
> >
> 
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