RE: [ECOS] Threading on EDB7211

[Alfredo Knecht <aknecht at cimsi dot cim dot ch>]

Dear list,

At 05:38 11.6.00 -0600, you wrote:
>
>On 11-Jun-00 Alfredo Knecht wrote:
>> Dear All,
>> 
>> Thread switching is not working.
>> I am using an off-the-shelf configuration for ARM EDB7111-2, with the
>> GDB_module stub on the board.
>> Specifically, I tested with lcd_test.c, and kthread1.c.
>> Only the first thread (in cyg_thread_create() calling order) is ever
executed.
>> A call to cyg_thread_delay() blocks, and cyg_thread_yield() does not cause
>> rescheduling.
>> Fidgeting with priorities does not help, either.
>> Generally, single-thread code works.
>> Must be that thread switching stays disabled in eCos, but since I am using
>> a "standard" configuration, I would like to have a second opinion before
>> embarking on a deep dive.
>> 
>
>Thread switching should work on this and all platforms.
>
>Have you tried any of the standard tests and/or examples?  A good one to
>try is the 'bin_sem2' test in the kernel.  This is an adaptation of the
>classic dining philosophers and definitely relies on thread switching to
>work properly.  On Linux, one would build/run this test like this:
>
>  # ecosconfig new edb7211
>  # ecosconfig tree
>  # make tests
>  # arm-elf-gdb install/tests/kernel/VERSION/tests/bin_sem2
>     ... etc.
>
>

I am puzzled, and probably doing something wrong. bin_sem2 hangs (see
below), as do the simpler standard tests like kthread1.
After deselecting RTC support, I compiled intr.c (which attaches its own
rtc handler), but this one hangs, too.
In lcd_test (a single-thread test) the cyg_thread_delay() call never
returns; commenting out the calls to cyg_thread_delay() helps, but this
amounts to not using ecos threading services at all.
The counter/timer 2 is working, its interrupt unmasked. Counting all
interrupts (in hal_IRQ_handler()) consistently brings a grand total of 2
before the board freezes.
Thanks for your help.
Alfredo
----------------------
Working directory /j/p1_install/tests/kernel/v1_3_1/tests.

(gdb) target remote com1
Remote debugging using com1
0xe0001750 in ?? ()

(gdb) load bin_sem2.exe
Loading section .rom_vectors, size 0x60 lma 0x8000
Loading section .text, size 0x96a8 lma 0x8060
Loading section .rodata, size 0x1bc3 lma 0x11708
Loading section .data, size 0x418 lma 0x132cc
Start address 0x8060 , load size 46819
Transfer rate: 26753 bits/sec, 302 bytes/write.

(gdb) cont
Continuing.

--------------------------

************************************************************************
Alfredo Knecht       Fax  ++41 91 610 8970          Tel ++41 91 610 8960
SUPSI-ICIMSI         aknecht@cimsi.cim.ch        http://www.cimsi.cim.ch

Istituto CIM della Svizzera italiana              CH-6928 Manno (Lugano)
************************************************************************