* MPC755 Porting Problem
@ 2001-12-15 6:24 Sangmoon Kim
0 siblings, 0 replies; 3+ messages in thread
From: Sangmoon Kim @ 2001-12-15 6:24 UTC (permalink / raw)
To: linuxppc-embedded
Hi?
I'm porting linux for a MPC755 board which I designed,
and having some trouble with arch/ppc/kernel/head.S
I load the kernel at phiscal address 0x00000000
and head.S seams to relocate it to 0xc0000000
The code is like this
mfmsr r0 /* Inst and data addr translations are disabled */
ori r0,r0,MSR_DR|MSR_IR /* enable Inst and data addr translation */
mtspr SRR1,r0
lis r0,start_here@h
ori r0,r0,start_here@l
mtspr SRR0,r0
SYNC
RFI /* jump to SRR0 */
start_here:
/* Call setup_cpu for CPU 0 */
li r3,0 /* data offset */
li r24,0 /* cpu# */
bl call_setup_cpu
It is running at base address 0x00000000.
start_here is at address 0xc000369c.
And the IBAT0, and DBAT0 is C0001FFE-00000002.
So after RFI it should go to start_here.
But If I insert some code like 'bl serial_hello',
which prints hello? to serial console after start_here.
It never prints a message. It works before the RFI.
Where can I start to debug it?
serial_hello is like this.
void
serial_hello()
{
serial_putc(SCC_A_ADDRESS,'h');
serial_putc(SCC_A_ADDRESS,'e');
serial_putc(SCC_A_ADDRESS,'l');
serial_putc(SCC_A_ADDRESS,'l');
serial_putc(SCC_A_ADDRESS,'o');
serial_putc(SCC_A_ADDRESS,'?');
serial_putc(SCC_A_ADDRESS,'\n');
serial_putc(SCC_A_ADDRESS,'\r');
}
Thanks in advance.
- Sangmoon Kim -
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread* AW: MPC755 Porting Problem
@ 2001-12-18 16:36 Babic Stefano
2001-12-19 6:37 ` Sangmoon Kim
0 siblings, 1 reply; 3+ messages in thread
From: Babic Stefano @ 2001-12-18 16:36 UTC (permalink / raw)
To: linuxppc-embedded
Hi,
we have already ported linux on our board based on MPC 755. The kernel is set at 0xc0000000, as you can see on arch/ppc/Makefile (KERNELLOAD=0xc0000000). We did not want to change it, because it is quite a standard value for external tools.
We are using the boot loader in mbx directory (or mbxboot, depending on version you are using), so we are using really the head_8260.S file instead of head.S.
>From the sources of the loader it seems necessary to load the kernel in high memory range (physical address), in any case greater as 0x400000 (which address is not important). Then the loader remapped it to 0xc0000000.
For us it is not a problem to load the kernel at a higher address and in this way the loader can correctly start the kernel.
I hope it could be help.
stefano babic
-----Ursprungliche Nachricht-----
Von: Sangmoon Kim [mailto:dogoil@etinsys.com]
Gesendet: Samstag, 15. Dezember 2001 07:24
An: linuxppc-embedded@lists.linuxppc.org
Betreff: MPC755 Porting Problem
Hi?
I'm porting linux for a MPC755 board which I designed,
and having some trouble with arch/ppc/kernel/head.S
I load the kernel at phiscal address 0x00000000
and head.S seams to relocate it to 0xc0000000
The code is like this
mfmsr r0 /* Inst and data addr translations are disabled */
ori r0,r0,MSR_DR|MSR_IR /* enable Inst and data addr translation */
mtspr SRR1,r0
lis r0,start_here@h
ori r0,r0,start_here@l
mtspr SRR0,r0
SYNC
RFI /* jump to SRR0 */
start_here:
/* Call setup_cpu for CPU 0 */
li r3,0 /* data offset */
li r24,0 /* cpu# */
bl call_setup_cpu
It is running at base address 0x00000000.
start_here is at address 0xc000369c.
And the IBAT0, and DBAT0 is C0001FFE-00000002.
So after RFI it should go to start_here.
But If I insert some code like 'bl serial_hello',
which prints hello? to serial console after start_here.
It never prints a message. It works before the RFI.
Where can I start to debug it?
serial_hello is like this.
void
serial_hello()
{
serial_putc(SCC_A_ADDRESS,'h');
serial_putc(SCC_A_ADDRESS,'e');
serial_putc(SCC_A_ADDRESS,'l');
serial_putc(SCC_A_ADDRESS,'l');
serial_putc(SCC_A_ADDRESS,'o');
serial_putc(SCC_A_ADDRESS,'?');
serial_putc(SCC_A_ADDRESS,'\n');
serial_putc(SCC_A_ADDRESS,'\r');
}
Thanks in advance.
- Sangmoon Kim -
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: MPC755 Porting Problem
2001-12-18 16:36 AW: " Babic Stefano
@ 2001-12-19 6:37 ` Sangmoon Kim
2001-12-20 1:19 ` Sangmoon Kim
0 siblings, 1 reply; 3+ messages in thread
From: Sangmoon Kim @ 2001-12-19 6:37 UTC (permalink / raw)
To: linuxppc-embedded
Thank you for response.
I solved the problem.
After the RFI, MMU begins to work.
I tried to access the phiscal address in serial_hello().
While the address is mapped to another area by BAT.
I think, It's something like the uncertainty theory.
We cannot watch a phenominan precisely, because the action of watching affects the phenominan.
Any way, I encountered another problem.
I'm porting linux on my MPC755 board.
It is the dump message of xmon after the kernel was crashed during initialization.
vector: 400 at pc = 20002024, lr = 20002024
msr = 40001032, sp = c0130320 [c0130270]
current = c012e420, pid = 0, comm = swapper
mon>
The point where it happens was in __alloc_bootmem_core.
After the following function.
memset(ret, 0, size);
where
ret = 0xC01D9000
size = 0x200040
Where can I start to debug this.
Thanks in advance.
- Sangmoon Kim -
----- Original Message -----
From: "Babic Stefano" <Stefano.Babic@icn.siemens.de>
To: <linuxppc-embedded@lists.linuxppc.org>
Sent: Wednesday, December 19, 2001 1:36 AM
Subject: AW: MPC755 Porting Problem
>
> Hi,
>
> we have already ported linux on our board based on MPC 755. The kernel is set at 0xc0000000, as you can see on arch/ppc/Makefile (KERNELLOAD=0xc0000000). We did not want to change it, because it is quite a standard value for external tools.
> We are using the boot loader in mbx directory (or mbxboot, depending on version you are using), so we are using really the head_8260.S file instead of head.S.
> From the sources of the loader it seems necessary to load the kernel in high memory range (physical address), in any case greater as 0x400000 (which address is not important). Then the loader remapped it to 0xc0000000.
> For us it is not a problem to load the kernel at a higher address and in this way the loader can correctly start the kernel.
>
> I hope it could be help.
>
> stefano babic
>
> -----Ursprungliche Nachricht-----
> Von: Sangmoon Kim [mailto:dogoil@etinsys.com]
> Gesendet: Samstag, 15. Dezember 2001 07:24
> An: linuxppc-embedded@lists.linuxppc.org
> Betreff: MPC755 Porting Problem
>
>
>
> Hi?
> I'm porting linux for a MPC755 board which I designed,
> and having some trouble with arch/ppc/kernel/head.S
> I load the kernel at phiscal address 0x00000000
> and head.S seams to relocate it to 0xc0000000
> The code is like this
>
> mfmsr r0 /* Inst and data addr translations are disabled */
> ori r0,r0,MSR_DR|MSR_IR /* enable Inst and data addr translation */
> mtspr SRR1,r0
> lis r0,start_here@h
> ori r0,r0,start_here@l
> mtspr SRR0,r0
> SYNC
> RFI /* jump to SRR0 */
>
> start_here:
> /* Call setup_cpu for CPU 0 */
> li r3,0 /* data offset */
> li r24,0 /* cpu# */
> bl call_setup_cpu
>
> It is running at base address 0x00000000.
> start_here is at address 0xc000369c.
> And the IBAT0, and DBAT0 is C0001FFE-00000002.
> So after RFI it should go to start_here.
>
> But If I insert some code like 'bl serial_hello',
> which prints hello? to serial console after start_here.
> It never prints a message. It works before the RFI.
>
> Where can I start to debug it?
>
> serial_hello is like this.
>
> void
> serial_hello()
> {
> serial_putc(SCC_A_ADDRESS,'h');
> serial_putc(SCC_A_ADDRESS,'e');
> serial_putc(SCC_A_ADDRESS,'l');
> serial_putc(SCC_A_ADDRESS,'l');
> serial_putc(SCC_A_ADDRESS,'o');
> serial_putc(SCC_A_ADDRESS,'?');
> serial_putc(SCC_A_ADDRESS,'\n');
> serial_putc(SCC_A_ADDRESS,'\r');
> }
> Thanks in advance.
> - Sangmoon Kim -
>
>
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: MPC755 Porting Problem
2001-12-19 6:37 ` Sangmoon Kim
@ 2001-12-20 1:19 ` Sangmoon Kim
0 siblings, 0 replies; 3+ messages in thread
From: Sangmoon Kim @ 2001-12-20 1:19 UTC (permalink / raw)
To: Sangmoon Kim, linuxppc-embedded
Hi
I have to reply to my mail.
It was a cache related problem.
I didn't initialize cache correctly.
Thank you for listening to my problem.
- Sangmoon Kim -
----- Original Message -----
From: "Sangmoon Kim" <dogoil@etinsys.com>
To: <linuxppc-embedded@lists.linuxppc.org>
Sent: Wednesday, December 19, 2001 3:37 PM
Subject: Re: MPC755 Porting Problem
>
> Thank you for response.
>
> I solved the problem.
> After the RFI, MMU begins to work.
> I tried to access the phiscal address in serial_hello().
> While the address is mapped to another area by BAT.
>
> I think, It's something like the uncertainty theory.
> We cannot watch a phenominan precisely, because the action of watching affects the phenominan.
>
> Any way, I encountered another problem.
> I'm porting linux on my MPC755 board.
> It is the dump message of xmon after the kernel was crashed during initialization.
>
> vector: 400 at pc = 20002024, lr = 20002024
> msr = 40001032, sp = c0130320 [c0130270]
> current = c012e420, pid = 0, comm = swapper
> mon>
>
> The point where it happens was in __alloc_bootmem_core.
> After the following function.
> memset(ret, 0, size);
> where
> ret = 0xC01D9000
> size = 0x200040
>
> Where can I start to debug this.
>
> Thanks in advance.
> - Sangmoon Kim -
>
> ----- Original Message -----
> From: "Babic Stefano" <Stefano.Babic@icn.siemens.de>
> To: <linuxppc-embedded@lists.linuxppc.org>
> Sent: Wednesday, December 19, 2001 1:36 AM
> Subject: AW: MPC755 Porting Problem
>
>
> >
> > Hi,
> >
> > we have already ported linux on our board based on MPC 755. The kernel is set at 0xc0000000, as you can see on arch/ppc/Makefile (KERNELLOAD=0xc0000000). We did not want to change it, because it is quite a standard value for external tools.
> > We are using the boot loader in mbx directory (or mbxboot, depending on version you are using), so we are using really the head_8260.S file instead of head.S.
> > From the sources of the loader it seems necessary to load the kernel in high memory range (physical address), in any case greater as 0x400000 (which address is not important). Then the loader remapped it to 0xc0000000.
> > For us it is not a problem to load the kernel at a higher address and in this way the loader can correctly start the kernel.
> >
> > I hope it could be help.
> >
> > stefano babic
> >
> > -----Ursprungliche Nachricht-----
> > Von: Sangmoon Kim [mailto:dogoil@etinsys.com]
> > Gesendet: Samstag, 15. Dezember 2001 07:24
> > An: linuxppc-embedded@lists.linuxppc.org
> > Betreff: MPC755 Porting Problem
> >
> >
> >
> > Hi?
> > I'm porting linux for a MPC755 board which I designed,
> > and having some trouble with arch/ppc/kernel/head.S
> > I load the kernel at phiscal address 0x00000000
> > and head.S seams to relocate it to 0xc0000000
> > The code is like this
> >
> > mfmsr r0 /* Inst and data addr translations are disabled */
> > ori r0,r0,MSR_DR|MSR_IR /* enable Inst and data addr translation */
> > mtspr SRR1,r0
> > lis r0,start_here@h
> > ori r0,r0,start_here@l
> > mtspr SRR0,r0
> > SYNC
> > RFI /* jump to SRR0 */
> >
> > start_here:
> > /* Call setup_cpu for CPU 0 */
> > li r3,0 /* data offset */
> > li r24,0 /* cpu# */
> > bl call_setup_cpu
> >
> > It is running at base address 0x00000000.
> > start_here is at address 0xc000369c.
> > And the IBAT0, and DBAT0 is C0001FFE-00000002.
> > So after RFI it should go to start_here.
> >
> > But If I insert some code like 'bl serial_hello',
> > which prints hello? to serial console after start_here.
> > It never prints a message. It works before the RFI.
> >
> > Where can I start to debug it?
> >
> > serial_hello is like this.
> >
> > void
> > serial_hello()
> > {
> > serial_putc(SCC_A_ADDRESS,'h');
> > serial_putc(SCC_A_ADDRESS,'e');
> > serial_putc(SCC_A_ADDRESS,'l');
> > serial_putc(SCC_A_ADDRESS,'l');
> > serial_putc(SCC_A_ADDRESS,'o');
> > serial_putc(SCC_A_ADDRESS,'?');
> > serial_putc(SCC_A_ADDRESS,'\n');
> > serial_putc(SCC_A_ADDRESS,'\r');
> > }
> > Thanks in advance.
> > - Sangmoon Kim -
> >
> >
> >
> >
>
>
>
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2001-12-20 1:19 UTC | newest]
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2001-12-15 6:24 MPC755 Porting Problem Sangmoon Kim
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2001-12-18 16:36 AW: " Babic Stefano
2001-12-19 6:37 ` Sangmoon Kim
2001-12-20 1:19 ` Sangmoon Kim
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