skyeye was Re: Blackfin interrupt handling patches

Joel Sherrill joel.sherrill at
Fri Aug 15 13:52:05 UTC 2008

Michael.Kang wrote:
> On Fri, Aug 15, 2008 at 5:34 AM, Allan Hessenflow <allanh at> 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).
> That is interesting. In fact , a developer have finish a patch that
> add an option in skyeye.conf to set the value of DIVISIOR. It should
> be merged soon.  Thanks for your information.
Is this going to be in the upcoming release you have planned?
Sounds like it would help. 

>> allan
>> --
>> Allan N. Hessenflow      allanh at

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