[Avila] Redboot via ethernet

[Matt Podolsky]

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Also you can always use fconfig once you've successfully telnet'ed and
Ctrl-C'ed in time once to increase the timeout before it loads the script
(the scale is 100ms so a value of 25 = the default 2.5 second timeout).

-matt

On 5/24/07, David Acker <dacker at roinet.com> wrote:
>
> Jim Thompson wrote:
> > David Boreham wrote:
> >> Probably a very dumb question (it's been 15 years since
> >> I last worked with embedded systems...) but on a from-the-factory
> >> board flashed with redboot and uclinux is there a way
> >> to either force redboot to talk via ethernet ? Mine boots all
> >> the way into Linux and I can telnet to it in that state.
> >> I'd like to tell it to drop back to redboot, or alternatively
> >> have some way to force redboot to halt before it boots
> >> linux.
> >>
> >> Can this be done, or do I need to break out my serial cable
> >> from behind the glass panel on the wall ?
> >
> > in theory you can re-write the redboot configuration area from linux and
> > eliminate the 'startup script' that actually loads and boots linux.
> >
> > The format is pretty simple, just a series of tagged data with a header
> > and checksum.
> >
> > The linux that comes loaded on flash reports:
> >
> > IXP4XX-Flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
> >  Intel/Sharp Extended Query Table at 0x0031
> > Using buffer write method
> > cfi_cmdset_0001: Erase suspend on write enabled
> > Searching for RedBoot partition table in IXP4XX-Flash.0 at offset
> 0x7e0000
> > 6 RedBoot partitions found on MTD device IXP4XX-Flash.0
> > Creating 6 MTD partitions on "IXP4XX-Flash.0":
> > 0x00000000-0x00080000 : "RedBoot"
> > 0x00080000-0x001c0000 : "zimage"
> > 0x001c0000-0x004e0000 : "ramdisk"
> > 0x004e0000-0x007e0000 : "unallocated"
> > 0x007e0000-0x007ff000 : "FIS directory"
> > 0x007ff000-0x00800000 : "RedBoot config"
> >
> > and...
> >
> > # ls -l /dev/mtd*
> > crw-rw-rw-    1 0        0         90,   0 /dev/mtd0
> > crw-rw-rw-    1 0        0         90,   2 /dev/mtd1
> > crw-rw-rw-    1 0        0         90,   4 /dev/mtd2
> > crw-rw-rw-    1 0        0         90,   6 /dev/mtd3
> > brw-rw-rw-    1 0        0         31,   0 /dev/mtdblock0
> > brw-rw-rw-    1 0        0         31,   1 /dev/mtdblock1
> > brw-rw-rw-    1 0        0         31,   2 /dev/mtdblock2
> > brw-rw-rw-    1 0        0         31,   3 /dev/mtdblock3
> > crw-rw-rw-    1 0        0         90,   1 /dev/mtdr0
> > crw-rw-rw-    1 0        0         90,   3 /dev/mtdr1
> > crw-rw-rw-    1 0        0         90,   5 /dev/mtdr2
> > crw-rw-rw-    1 0        0         90,   7 /dev/mtdr3
> > # mknod /dev/mtd4 c 90 8
> > # mknod /dev/mtdr4 c 90 9
> > # mknod /dev/mtd5 c 90 10
> > # mknod /dev/mtdr5 c 90 11
> > # cat /dev/mtd5
> >
> > -zN
> >    boot_script
> >               boot_script_databoot_scriptfis load ramdisk
> > fis load zimage
> > exec
> >
> > boot_script_timeoutboot_scriptbootpbootp_my_gateway_ipbootp
> >
> > bootp_my_ipbootp@(bootp
> > _my_ip_maskbootpbootp_server_ip@(console_baud_rateB
> > gdb_port#(info_console_for
> > ceinfo_console_numberinfo_console_force
> > net_debug
> > #        net_devicenpe_eth0h0^-^-1
> >
> >
> > You'll need to write the little utility that properly configures the
> > area, of course.
> >
> See http://lists.unixstudios.net/avila/2007/02/751 for info on such
> utility and what you need to do to make it work.  We use it to change
> the boot line between a failsafe image and a production image.
>
> I would recommend breaking out that serial cable if you plan on changing
> the code on this board.  It is always nice to have the console output
> when you screw something up.
> -Ack
>
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