Dear Rob Sciuk,
> On Fri, 22 Feb 2013, Miod Vallat wrote:
> > Date: Fri, 22 Feb 2013 22:48:47 +0000
> > From: Miod Vallat <m...@online.fr>
> > To: Rob Sciuk <r...@controlq.com>
> > Cc: arm@openbsd.org
> > Subject: Re: Any platform useful as a graphical desktop?
> >
> >> I used the tftp/bootp protocol to load the kernel, the initrd and
> >> the fdt into RAM from u-boot (the auto-boot), and then pass the
> >> three addresses (fixed) to the bootm command in order: bootm
> >> 0x100000 0x200000 0x3000000. Of course, I had to extend the BOOTP
> >> protocol with an OEM extension to allow Bootp to know about the FDT,
> >> but that facility was already in U-Boot -- you simply need to look.
> >
> > So you had to extend an RFC protocol to boot some form of Linux. Sure,
> > that's the way thing go - I'm gonna fix my bootp server right now to
> > support the wicked way Linux on ARM does things, just so that I get a
> > thin chance for a kernel to recognize the world it's running in.
> >
> > Am I the only one to think that we are trying to walk on our heads where
> > the way to boot a kernel is to chainsaw a good-old-comes-with-an-RFC
> > protocol to the greedy needs of a particular operating system?
> >
> >> They do risk being spoiled by their own success ... OK ... everyone
> >> drop arm, and go to MIPS -- immediately! 8-)
> >
> > I'd drink to that.
>
> If you are serious about changing your dhcpd configuration, here at least
> is the .conf file for dhcpd -- or a segment of it, which demonstrates the
> mechanism I used:
>
> option boot-device-tree code 132 = text ;
> option boot-file-system code 133 = text ;
>
> # hotwire1 boards
> #
> class "hotwire1" {
> match if substring( dhcp-client-identifier, 0, 9 ) = "hotwire1_" ;
>
> filename "hotwire1.uImage" ;
> option boot-device-tree "hotwire1.fdt" ;
> option boot-file-system "hotwire1.initrd" ;
> }
Bootp is weird junk, just use tftp to transfer your files (using the 'tftp'
command in U-Boot) and then 'bootm' that stuff. Note that the FDT location is
passed to the kernel in one of the CPU registers, R2 IIRC.
Best regards,
Marek Vasut
