Hi,
We are currently porting Linux 2.4.7 on ADs- Graphics Client Plus board.
We are facing a problem as described below:-
We would like to know in what way we can get the help/consultancy
for the below mentioned problem.
Problem definition:-
We have modified the kernel source code to make Standard Linux
real time in the following way:-
1) For each IRQ line we have created a kernel thread(eg:-ethernet,serial,LCD
and keyboard)
The driver handler is invoked from this thread.(The handlers for the
drivers are installed at
boot time)
2) The bottom half is now a kernel thread.
3) and signal queing (for timer only) is also a kernel thread.
We are facing the following problem while booting:-
After the initial boot message
Uncompressing Linux.........................done,booting the kernel the
system hangs.
We debugged the head-armv.S file and we made the following observations :-
In the head-armv.S we added the following debugging statements to find the
sequence
mov r0, #F_BIT | I_BIT | MODE_SVC @ make sure svc mode
msr cpsr_c, r0 @ and all irqs disabled
>> bl SYMBOL_NAME(myfunction1)
bl __lookup_processor_type
teq r10, #0 @ invalid processor?
moveq r0, #'p' @ yes, error 'p'
>> bl SYMBOL_NAME(myfunction1)
beq __error
>> bl SYMBOL_NAME(myfunction1)
bl __lookup_architecture_type
teq r7, #0 @ invalid architecture?
moveq r0, #'a' @ yes, error 'a'
beq __error
>> bl SYMBOL_NAME(myfunction1)
bl __create_page_tables
adr lr, __ret @ return address
.........
.........
__error:
>> bl SYMBOL_NAME(myfunction2)
#ifdef CONFIG_DEBUG_LL
mov r8, r0 @ preserve r0
adr r0, err_str
bl printascii
mov r0, r8
bl printch
where myfunction1 and myfunction2 are function defined in the init/main.c
file
void myfunction1()
{
puts("Test1\n");
}
void myfunction2()
{
puts("Test2\n");
}
The following output occurs on booting
Uncompressing Linux...................................done,booting the
kernel
Test1
Test1
Test2
This indicates that the __lookup_processor_type fails.
Could you find a possible solution?
Regards,
Krishnakant/Chnadrasekhar
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Feb 28 2002 - 21:00:36 EST