[openfirmware] TFTP Block Size setting?

[Alec]

Sorry I'm dealing with IBM pSeries p8 generation hardware.  I'm not sure
how to tell what version or origin of Open Firmware I have.  They focus on
their SMS management ui more than the ok? prompt.  Sorry I can't provide
more details.  To be honest I'm hoping to find a way to do what I need, and
willing to do a small amount of trial and error to get there.

Open Firmware is not something IBM support is too savvy on.

Alec
On Jun 10, 2016 1:14 PM, "Mitch Bradley" <wmb at firmworks.com> wrote:

> What exactly is "AIX Open Boot"?  Open Firmware implementations are
> usually tied to a specific hardware platform and not to an operating
> system.  Over the years, several different Open Firmware
> implementations, including the FirmWorks implementation (which is what
> James is calling "Open Firmware") and I believe multiple different ones
> from various groups in IBM, have been able to boot AIX.
>
> Unless you know which implementation is present, it is hard to say what
> optional features that implementation might support.
>
> Some, perhaps most, of the IBM Open Firmware implementations, were
> derived from an early version of Apple's Open Firmware.  That early
> version was lacking some interactive features, which made it more
> difficult to modify than the FirmWorks OFW of the same time period, but
> I think that, over time, the IBM implementations got better.
>
> "Out of the box", the FirmWorks Open Firmware only supports the default
> TFTP blocksize, but I remember hacking it to support larger blocks for a
> specific need.  The details of what I did elude me, but I don't think it
> was a difficult change.
>
> On 6/9/2016 10:22 PM, James Cameron wrote:
> > Yes, Open Firmware can do HTTP;
> >
> >     ok boot http:\\server\path
> >
> > but my tests of these are usually DHCP mediated rather than BOOTP and
> > three years ago; I don't remember doing it with BOOTP.
> >
> > NFS is also possible on Open Firmware;
> >
> >     ok boot nfs:\\server\path
> >
> > When using HTTP or NFS in Open Firmware change "/" to "\" everywhere
> > in a URL, since "/" has a meaning in the device tree parsing.
> >
> > And again; no idea about AIX open boot.
> >
> > If you can get to the prompt, try it manually, with a prepared file
> > offered by HTTP.
> >
> > cat >> test << EOF
> > \ test
> > ." test" cr
> > EOF
> >
> > cp ... # to http server document root
> >
> > ...
> >
> >     ok boot http:\\server\path\test
> >
> > On Fri, Jun 10, 2016 at 12:41:51AM -0700, Alec wrote:
> >> Thank you for sharing this, definitely looks like the blksize isn't
> variable
> >> here.  Next would be to see if AIX open boot supports the http
> interface for
> >> receiving the boot image.
> >> I will try modifying the /etc/bootptab to define the tftp filename as a
> URL and
> >> see if that works.  Let me know if at the surface if the below bootp
> config
> >> should cause Open Firmware to retrieve the file over http, if IBM Open
> Firmware
> >> supports http...
> >>
> >> eg. (using data from [1]here)
> >> # modify /etc/bootptab to insert "[2]http://50.21.100.48"
> >> aix21.domain.com:bf=[3]
> http://50.21.100.48/tftpboot/aix21.domain.com:ip=
> >> 10.200.50.56:ht=ethernet:sa=50.20.100.48:gw=10.200.50.1:sm=[4]
> 255.255.255.0:
> >>
> >> Hope that works tomorrow, otherwise time to build out a new NIM service.
> >>
> >> Alec
> >>
> >> On Thu, Jun 9, 2016 at 7:37 PM, James Cameron <[5]quozl at laptop.org>
> wrote:
> >>
> >>     I don't have the source for AIX open boot, but in Open Firmware the
> >>     TFTP implementation is without block size support.
> >>
> >>     References:
> >>
> >>     1.
> >>     [6]
> https://code.coreboot.org/p/openfirmware/source/tree/HEAD/ofw/inet/
> >>     tftp.fth
> >>
> >>     2.
> >>     [7]https://tools.ietf.org/html/rfc2348 "blksize"
> >>
> >>     On Thu, Jun 09, 2016 at 06:20:13PM -0700, Alec wrote:
> >>     > I am attempting to do an IBM NIM install across a 20ms latency.
> >>     >
> >>     > Is there an ability to kick off the network boot on AIX open boot
> with a
> >>     block
> >>     > size option for tftp from the ok? Prompt?
> >>     >
> >>     > Forgive me if this is not an appropriate place for this.
> >>     >
> >>     > Alec
> >>
> >>     --
> >>     James Cameron
> >>     [8]http://quozl.netrek.org/
> >>
> >> References:
> >>
> >> [1]
> http://aix4admins.blogspot.com/2013/07/bootpd-this-is-initial-communication.html
> >> [2] http://50.21.100.48/
> >> [3] http://50.21.100.48/
> >> [4] http://255.255.255.0/
> >> [5] mailto:quozl at laptop.org
> >> [6]
> https://code.coreboot.org/p/openfirmware/source/tree/HEAD/ofw/inet/tftp.fth
> >> [7] https://tools.ietf.org/html/rfc2348
> >> [8] http://quozl.netrek.org/
> >
>
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