skyeye was Re: Blackfin interrupt handling patches

Ed Sutter esutter at
Fri Aug 15 11:59:22 UTC 2008

Just noticed mention of the BF537...
Does this BSP have an ethernet driver?

Allan Hessenflow wrote:
>> Allan Hessenflow wrote:
>>> The basic problem here is that skyeye is not loading section .l1code,
>>> which is where the ezkit533 bsp puts its startup code.  I don't know
>>> skyeye well enough to know how to get it to load that section.  One
>>> workaround is to modify /c/src/lib/libbsp/bfin/shared/start/start.S,
>>> changing the line:
>>>         .section .l1code
>>> to:
>>>         .section .init
>>> skyeye does load the .init section.  I don't know what the reason is
>>> for putting the startup code in .l1code (which points to onboard SRAM),
>>> so I can't say if it's reasonable to change that for the eZKit533 BSP.
>>> I do put the startup code in .init for my bf537 Stamp BSP.
>>> When I just did that for eZKit533, it made hello.exe work correctly with
>>> skyeye 1.2.4 and 1.2.5.  However, ticker.exe only worked correctly with
>>> skyeye 1.2.4; under skyeye 1.2.5 it fails with an io error.  I'll look
>>> into that a little later.
> For that last problem, I had negelected to make a change to skyeye 1.2.5
> that I had put into 1.2.4; change BF533_HZ in arch/bfin/mach/bf533_io.c
> from 50 to 70000.  If I do that then the eZKit533 ticker.exe works again.
> This change is noted in the rtems wiki on the EZKit533 and the SkyEye
> pages.  I suppose that without it timer interrupts are occurring too
> quickly and blowing the stack, although I haven't examined it in any detail
> to see if that is really what's happening.
> Incidentally, I also changed BF537_HZ in bf537_io.c to see if I could get
> ticker.exe built against my BF537 BSP to run under skyeye.  It did run
> (after disabling some register accesses that skyeye doesn't seem to know
> exist on the BF537), but I found I didn't have to increase BF537_HZ nearly
> as much as I had to increase BF533_HZ (5000 seems to work fine, while
> BF533_HZ seems to need something close to 70000).
> allan

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