RE: fLASHING PROBLEM

Thanx Brian thanx for all help. Well I am on the stage when I have =
checked
and rechecked the image on my SRAM card which is 2MB. After that when I =
put
the image on the access point to flash it, it gives me nothing but junk =
on
the terminal. There cud be a possibility that I am not jumping it =
correctly
with j2 jumper. But can you please suggest me the timing of the whole
process. After you jump j2 which lights comes flashing and may be if you =
can
tell for how much time. Also as soon as you jump the j2, does it show on =
the
terminal that linux has started booting (on minicom). And how much does =
it
take for the whole process. IT will be really useful for me , if you can
suggest. I think I am on the edge to do it right, but something is going
wrong.

Thanx...

Gaurav

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Brian =
Wilson
Sent: Wednesday, February 18, 2004 10:09 PM
To: Linux Access Point Development
Subject: Re: [LinuxAP-dev] fLASHING PROBLEM

Welcome. I have had my first pair of USR2450's running reliably for a
week or so now. I am now a know-it-all. HA. The road was bumpy to get
my first unit flashed. Second one took about 20 minutes.  :-) The bits
for this message flew between the two units. Persevere! It's fun once
you get them running.

First make sure that your image downloaded from the Web okay -- some
that I downloaded did not match the md5 from the site. Make sure the
image is written correctly into the SRAM card -- write the image to
the card, read it back, and compare the one you read back with the
original. (Use 'cmp' command.)

If you are using a 4 MB card, write the image to the
card twice by copying the file twice like for instance

	cat sram.img sram.img > sram4mb.img

Then burn sram4mb.img to your card.  The reason (as I understand it)
is that the bootloader is at one end of the card and the image at the
other so a 4MB flashed as described looks like this:

 addr		    content

 low address        boot loader		        first sram.img
 end of first 2MB   image (ignored)
 2MB                boot loader (ignored)	second sram.img copy
 end of 4MB memory  image to be put in flash

When you boot off the 4MB card in the Eumitcomm, it will load the
loader from low memory (addr 0) and execute it, and the loader will
then copy the 1MB image ending at the high memory position into the
board's internal 1MB flash. If you burn a single 2MB image into a 4MB
board then there will only be blank memory at the end-of-memory
locations so your attempt will fail. (If you use an 8 MB you need
to copy the 2MB 4 times. etc to end up with the flash image at
the top end, not to 'fill up the card' as is written elsewhere.)

Depending on what you are doing with the units you might also need to
reflash the pc cards. I wanted mine to be able function as normal
access points and they were both early, rev 1A units. (Brand new --
they must have been on a warehouse shelf for a long time.) so I
needed to update them.  I suggest you worry about getting Linux
running first though.

Did I explain this correctly and understandably??  Maybe you know all
this already but it might help someone else...

--=20
Brian Wilson
Corvallis, Oregon
541-757-2045



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