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Subject: "Bad checksum" when booting Rockbox on U.S. Iriver H320 while fully powered down

"Bad checksum" when booting Rockbox on U.S. Iriver H320 while fully powered down

From: James Teh <>
Date: Fri, 15 Jun 2007 12:13:58 +1000

Hi all,

I have a friend's U.S. Iriver H320 sitting on my desk which is
exhibiting some rather strange behaviour. When attempting to power up
while the unit is fully powered down (not on charge, decently charged
battery), it spins up the drive, attempts to load Rockbox and fails a
few seconds later with a "Bad checksum" error. Strangely, connecting it
to USB while powered down so that it enters bootloader USB mode and then
disconnecting allows it to start Rockbox with no problems. I have tried
zeroing the start and end of the drive, repartitioning and reformatting,
several versions of Rockbox and reflashing the firmware, all with no
change. I can start the Iriver firmware with no problems with rec+play.

The unit was running bootloader v5. Hoping that perhaps it might work
with the new bootloader from SVN, I decided to risk building the
bootloader from svn and flashing it on to the unit. This worked without
problems, but alass, I still receive a "bad checksum" error when booting
when fully powered down. Stranger still, powering down, plugging in the
charger (entering the new bootloader charging screen) and then powering
up allows the unit to boot Rockbox with no problems.

To summarise, booting Rockbox when fully powered down fails with a "Bad
checksum" error, but booting Rockbox when on the bootloader charging
screen or after bootloader USB mode works correctly. Booting the Iriver
firmware always works.

Apparently, this started happening after the unit's battery was
accidentally drained while playing audio in Rockbox, causing it to power
down. I don't really see how this is related. The only thing that makes
any sense is that some sort of hardware damage was caused, but this
doesn't explain how it is able to boot Rockbox fine when in the charging
screen or after USB bootloader mode.

Any ideas? I am totally at a loss.


James Teh
MSN Messenger:
Yahoo: jcs_teh
Received on 2007-06-15

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