[okl4-developer] Stuck in kmem::free()

[Charles Chiou]

Hi Geoffrey,

I'm loading image.boot to physical 0xc0100000. When it starts execution, the
MMU is turned off.

I've not modified kernel sources other than platform additions.

Thanks

Charles


On 7/22/08 11:53 AM, "Geoffrey Lee" <glee at ok-labs.com> wrote:

> On Sun, Jul 20, 2008 at 05:31:48PM +0800, Charles Chiou wrote:
>> Hi,
>> 
>> I'm in the process of trying to port pistachio to an SoC with an ARM926EJ-S
>> core. It seems to run into prefetch abort exception in kmem::free(). I'd
>> appreciate if somebody could shed some lights on what I'm doing wrong.
> 
> Hi Charles
> 
> How did you load your binary to the system and which address did you
> load it to?  Have you made any other modifications to the OKL4 source
> code other than adding in your platfrom description?
> 
> -gl
> 
>> 
>> The place it occurs is (where r3 is 0x10000100):
>> 
>> _ZN6kmem_t4freeEPvm:
>> 0xF0004268 E92D40F0    STMFD       SP!,{R4-R7,LR}
>> 0xF000426C E59F318C    LDR         R3,[PC,#+0x18c]
>> 0xF0004270 E5933000    LDR         R3,[R3,#+0]
>> 0xF0004274 E24DD010    SUB         SP,SP,#0x10
>> ...
>> 0xF00043E4 EAFFFFAD    B           0xf00042a0
>> 0xF00043E8 E5933010    LDR         R3,[R3,#+0x10]    <--- !!!
>> 0xF00043EC E3130002    TST         R3,#0x2
>> 0xF00043F0 0AFFFFA6    BEQ         0xf0004290
>> 0xF00043F4 E3A0003D    MOV         R0,#0x3d
>> 0xF00043F8 EB0026AB    BL          _Z12tb_log_eventm ;
>> _Z12tb_log_eventm=0xf000deac
>> 0xF00043FC EAFFFFA3    B           0xf0004290
>> 
>> It looks like kmem:free() is called with (start = 0xf0022590, end =
>> 0xf0100000).
>> 
>> I'm stuck before the console is up, which is makes debugging very difficult
>> :( However, I also think the init hasn't run into where I mapped the
>> physical memory of my uart to 0xf9000000 (writing there doesn't output
>> anything).
>> 
>> This is my machine.py:
>> 
>> class a2(arm926ejs):
>>     platform = "ambarella"
>> 
>> class a2bub(a2):
>>     virtual = False
>>     memory = a2.memory.copy()
>>     memory['physical'] =     [Region(0xc0100000L, 0xc1000000L)]
>>     bootimage = "binary"
>> 
>> 
>> Thanks for the help!
>> 
>> Charles
>> 
>> 
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