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Subject: iRiver builds (was Re: Scrolling thread on iriver)

iRiver builds (was Re: Scrolling thread on iriver)

From: Dave Hooper <>
Date: 2005-06-15

Hmm, all my iRiver builds fail on the target with Illegal Instruction
immediately after the rockbox splash screen logo.
I don't see anything obviously wrong with my cygwin environment - do
ou? - any ideas?

gcc 3.4.4-1
binutils 20050608-2
m68k-elf-gcc 3.4.3-EL-2
m68k-binutils 2.15.96-EL-1


----- Original Message -----
From: "Dave Hooper" <>
To: "Rockbox development" <>
Sent: Tuesday, June 14, 2005 9:04 PM
Subject: Re: Scrolling thread on iriver

>> You could possibly save the shifting, but not the masking.
> Naturally.
>> It
>> might be a bit more efficient, but imho not that much.
>> It would also require additional code in lcd_bitmap(), since
>> the current implementation always starts reading at bit 0 in
>> the source bitmap.
> Yep - because that would be necessary for any kind of 'partial blit'
> routine anyway
>> Btw, the jerky scrolling you observed is certainly not a problem
>> with the lcd code performance, but rather caused by other
>> threads not yielding frequently enough. Rockbox uses a simple
>> cooperative round-robin scheduler, and if even one single thread
>> holds the cpu for too long, the scrolling can't be smooth.
> Totally agree. So the less time the scroll thread itself requires, the
> earlier those other threads can take a chance at running, which would
> increase the chance of smooth scrolling ;-)
>> Regards, Jens
> _______________________________________________

Received on Wed Jun 15 09:41:55 2005

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