Hi Joakim,
Joakim Wennergren wrote:
This is mainly a RedBoot question, but I can't think of any better list
to post it.
I've stated to dismantle a new hardware I've got (a small
firewall/router), and managed to attach a serial cable to it. When it
boots up I get RedBoot, but it's an odd version, It calls itself:
RedBoot(tm) bootstrap and debug environment [ROM]
Non-certified release, version v2_0 - built 22:17:05, Dec 22 2005
Is this hardware ixp4xx based?
Intel released versions of redboot for the ixp4xx that where
stamped as 2.0 a fews year back. I'd guess it is one of these.
So it seems to be a modified RedBoot, nothing new there. But when I
checked what commands I had, there were only a short list; "channel",
"help", "ip_address", "linux", "load", "switch", "wdog" and "flash". No
fis commands :(
The vendor probably didn't use the redboot partition layout.
And so configured out "fis".
As far as I can tell there is no list of partitions on the flash at all,
just the Linux kernel and then the file system appended to the end of
it... An the Linux kernel seems to unpack an area of the flash into RAM
and using it as a ramdrive.
So what I need help with is where to burn my own images. I compiled the
vendors released kernel, but as usual when vendors are forced to release
the kernel under GPL they stripped it bare. When I installed it using
the web interface it boots Linux but failed to unpack the ramdisk and is
pretty much useless.
No MTD driver setup in the kernel?
The Linux boots up using the RedBoot command
linux -b 0x400000 -l 0x0010f9c4 -s 0x001a50e9 -c "console=ttyS0,38400"
What might be mapped here depends on the CPU and board...
Regards
Greg
And the "help" output from RedBoot is:
RedBoot> help
Display/switch console channel
channel [<channel number>]
Help about help?
help [<topic>]
Set/change IP addresses
ip_address [-l <local_ip_address>] [-h <server_address>]
Execute a Linux image
linux [-w timeout] [-b <base address> [-l <image length>]]
[-r <ramdisk addr> [-s <ramdisk length>]]
[-c "kernel command line"]
Load a file
load [-r] [-v] [-h <host>] [-m <varies>] [-c <channel_number>]
[-b <base_address>] <file_name>
cat switch value
switch no
set watchdog
wdog no
flash upgrade
flash [-s <source>][-d <destination>][-l <image length>]
So I guess it reads the kernel from 0x400000, but what that address
means I have no clue :( I can't write to it using "flash", so it's not
the start of the flash. And I don't want to try addresses randomly since
I might overwrite RedBoot and brick the router completely.
So any tips on where to burn the image? "load" works just fine so I can
load images, but I don't know where to burn it.
I found a similar hardware described at OpenWRT:
http://wiki.openwrt.org/OpenWrtDocs/Hardware/Sitecom/WL-153
The redboot and linux boot log are nearly identical to what I'm seeing.
They managed to burn a firmware by using this redboot command:
flash -s 0x100000 -d 0xffe08000 -l 0x19EDFB
When I try this (with different "-l" size) I get "Wrapper error". I
assume that means I'm writing to the wrong address, or?
I managed to "hack" their released firmware so I have access to the
contents of their file system, but all flash burning tools are compiled
binaries so I can't find any addresses there.
In worst case I could maybe figure out the JTAG pins on the hardware,
but I don't have any JTAG burning stuff, I'd have to borrow some. And
considering how non-standard the serial port was the pins are probably
all jumbled... I'd rather not go that way.
regards
Joakim Wennergren
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SnapGear -- a Secure Computing Company PHONE: +61 7 3435 2888
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