[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function.

[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function.

[gforgcc]

Hi geeks, 
i am trying to bring up the latest kernel on EP8248 target,
i am using U-boot-1.3.2 and linux-2.6.25-rc8, i started debugging using
BDI2000 which helped me to know atleast what is going wrong, i have added
some printk's in the kernel source but still i am not able to find where and
what exactly is going wrong, The first statement it is printing in the log
buffer is 
""Using Embedded Planet EP8248E machine description"" and thats it the next
message is 
Unable to handle kernel paging request for data at address 0xbfff0000
Faulting instruction address:0xc0012070 (This nearest address to this
address in System.map file is cacheable_memzero)
and tracing like this i came to know that in the file
arch/powerpc/mm/ppc_mmu_32.c , here in the function __init MMU_init_hw() and
in the line n_hpteg = total_memory / (PAGE_SIZE * 8); probably it is getting
problem because when i tried to print the variable total_memory it is
printing zero !!! :( :(  so probably i am thinking it is not able to find
some memory for Hash table :(
Please share your knowledge and skills and help me to resolve this issue..
thanks  :)
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[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function

[gforgcc]

Hi geeks,
i am trying to bring up the latest kernel on EP8248 target,
i am using U-boot-1.3.2 and linux-2.6.25-rc8, i started debugging using
BDI2000 which helped me to know atleast what is going wrong, i have added
some printk's in the kernel source but still i am not able to find where and
what exactly is going wrong, The first statement it is printing in the log
buffer is
""Using Embedded Planet EP8248E machine description"" and thats it the next
message is
Unable to handle kernel paging request for data at address 0xbfff0000
Faulting instruction address:0xc0012070 (This nearest address to this
address in System.map file is cacheable_memzero)
and tracing like this i came to know that in the file
arch/powerpc/mm/ppc_mmu_32.c , here in the function __init MMU_init_hw() and
in the line n_hpteg = total_memory / (PAGE_SIZE * 8); probably it is getting
problem because when i tried to print the variable total_memory it is
printing zero !!! :( :(  so probably i am thinking it is not able to find
some memory for Hash table :(
Please share your knowledge and skills and help me to resolve this issue..
thanks  :)
-- 
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[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function.

[Scott Wood]

On Tue, Apr 22, 2008 at 09:12:11PM -0700, gforgcc wrote:
> i am trying to bring up the latest kernel on EP8248 target,
> i am using U-boot-1.3.2 and linux-2.6.25-rc8, i started debugging using
> BDI2000 which helped me to know atleast what is going wrong, i have added
> some printk's in the kernel source but still i am not able to find where and
> what exactly is going wrong, The first statement it is printing in the log
> buffer is 
> ""Using Embedded Planet EP8248E machine description"" and thats it the next
> message is 
> Unable to handle kernel paging request for data at address 0xbfff0000
> Faulting instruction address:0xc0012070 (This nearest address to this
> address in System.map file is cacheable_memzero)
> and tracing like this i came to know that in the file
> arch/powerpc/mm/ppc_mmu_32.c , here in the function __init MMU_init_hw() and
> in the line n_hpteg = total_memory / (PAGE_SIZE * 8); probably it is getting
> problem because when i tried to print the variable total_memory it is
> printing zero !!! :( :(  so probably i am thinking it is not able to find
> some memory for Hash table :(

Are you using a device-tree-aware u-boot with uImage, or are you using
cuImage.pq2?  Do not use dtbImage.ep8248e; that's for PlanetCore.

ep8248e in mainline u-boot doesn't appear to be device-tree aware.

If you're using cuImage.pq2, do you get any output from the bootwrapper? 
Make sure you add /chosen/linux,stdout-path.  There may be other device
tree changes you need to make it work with u-boot as well.

-Scott

[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function.

[Narendra KA]

   Thanks for the reply scott, :)

i forgot to mention , yes i am using device tree aware u-boot but the 
problem is when i tried to build the u-boot source ( first i did ""make 
ep8248_config"" and then ""make"") it was giving undefined reference 
related to ft_board_setup() function so i altered the U-boot-1.3.2 source 
code... i added the below code to the following file board/ep8248/ep8248.c

#if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP)
void ft_board_setup(void *blob, bd_t *bd)
{
        ft_cpu_setup(blob, bd);
}
#endif /* defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP) */


and also added the below lines to the file include/configs/ep8248.h by 
looking into the corresponding .dts file in the kernel source....


/* pass open firmware flat tree */
#define CONFIG_OF_LIBFDT        1
#define CONFIG_OF_BOARD_SETUP   1

#define OF_CPU  "PowerPC,8248 at 0"
#define OF_SOC  "soc at f0000000"
#define OF_TBCLK        (bd->bi_busfreq / 4)
#define OF_STDOUT_PATH  "/soc at f0000000/serial at 11a80"

Now afte doing the above 2 alterations i was able to build the 
u-boot-1.3.2 source for ep8248e....

then i created the uImage with the latest kernel source linux-2.6.25-rc8 
and put that uImage to the target...also i created the ep8248e.dtb from 
the dtc (DEVICE TREE COMPILER) and put that to the target and passed this 
as an argument to the bootm 
I also cross checked in the U-boot environment for the fdt command ... it 
was present
this is what i have done till now 
Finally when it hanged I started debugging using BDI2000...so it was stuck 
as i said in my previous post
and how to use cuImage.pq2 ? also i dint get what is dtbImage.ep8248e ? is 
that same to ep8248e.dtb ??
Can you Please tell me how can i proceed further to get the Kernel up on 
the ep8248e target ?? 

Regards,
Naren





Scott Wood <scottwood@freescale.com> 
04/23/2008 09:57 PM

To
gforgcc <narendra.ka@lntemsys.com>
cc
u-boot-users at lists.sourceforge.net
Subject
Re: [U-Boot-Users]  Kernel hanging after lmb_end_of_DRAM() function.






On Tue, Apr 22, 2008 at 09:12:11PM -0700, gforgcc wrote:
> i am trying to bring up the latest kernel on EP8248 target,
> i am using U-boot-1.3.2 and linux-2.6.25-rc8, i started debugging using
> BDI2000 which helped me to know atleast what is going wrong, i have 
added
> some printk's in the kernel source but still i am not able to find where 
and
> what exactly is going wrong, The first statement it is printing in the 
log
> buffer is 
> ""Using Embedded Planet EP8248E machine description"" and thats it the 
next
> message is 
> Unable to handle kernel paging request for data at address 0xbfff0000
> Faulting instruction address:0xc0012070 (This nearest address to this
> address in System.map file is cacheable_memzero)
> and tracing like this i came to know that in the file
> arch/powerpc/mm/ppc_mmu_32.c , here in the function __init MMU_init_hw() 
and
> in the line n_hpteg = total_memory / (PAGE_SIZE * 8); probably it is 
getting
> problem because when i tried to print the variable total_memory it is
> printing zero !!! :( :(  so probably i am thinking it is not able to 
find
> some memory for Hash table :(

Are you using a device-tree-aware u-boot with uImage, or are you using
cuImage.pq2?  Do not use dtbImage.ep8248e; that's for PlanetCore.

ep8248e in mainline u-boot doesn't appear to be device-tree aware.

If you're using cuImage.pq2, do you get any output from the bootwrapper? 
Make sure you add /chosen/linux,stdout-path.  There may be other device
tree changes you need to make it work with u-boot as well.

-Scott

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[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function

[Nethra]

U can refer to patch for ep8248 support here
                   http://patchwork.ozlabs.org/linuxppc/patch?id=15772

best wishes,
Nethra

>Hi geeks,
>i am trying to bring up the latest kernel on EP8248 target,
>i am using U-boot-1.3.2 and linux-2.6.25-rc8, i started debugging using
BDI2000 which helped me to >know atleast what is going wrong, i have added
some printk's in the kernel source but still i am not able >to find where
and what exactly is going wrong, The first statement it is printing in the
log buffer is
>""Using Embedded Planet EP8248E machine description"" and thats it the next
message is
>Unable to handle kernel paging request for data at address 0xbfff0000
Faulting instruction >address:0xc0012070 (This nearest address to this
address in System.map file is cacheable_memzero)
>and tracing like this i came to know that in the file
arch/powerpc/mm/ppc_mmu_32.c , here in the >function __init MMU_init_hw()
and in the line n_hpteg = total_memory / (PAGE_SIZE * 8); >probably it is
getting problem because when i tried to print the variable total_memory it
is printing >zero !!! :( :(  so probably i am thinking it is not able to
find some memory for Hash table :(
>Please share your knowledge and skills and help me to resolve this issue..
>thanks  :)

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[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function

[Wolfgang Denk]

In message <16833978.post@talk.nabble.com> you wrote:
> 
> i am trying to bring up the latest kernel on EP8248 target,
...
> Please share your knowledge and skills and help me to resolve this issue..

I can't help with your Linux kernel problem, but I'm pretty sure that
it is off topic on this mailing list.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Any technology distinguishable from magic is insufficiently advanced.

[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function.

[Scott Wood]

On Thu, Apr 24, 2008 at 11:01:39AM +0530, Narendra KA wrote:
>    Thanks for the reply scott, :)
> 
> i forgot to mention , yes i am using device tree aware u-boot but the 
> problem is when i tried to build the u-boot source ( first i did ""make 
> ep8248_config"" and then ""make"") it was giving undefined reference 
> related to ft_board_setup() function so i altered the U-boot-1.3.2 source 
> code... i added the below code to the following file board/ep8248/ep8248.c
> 
> #if defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP)
> void ft_board_setup(void *blob, bd_t *bd)
> {
>         ft_cpu_setup(blob, bd);
> }
> #endif /* defined(CONFIG_OF_LIBFDT) && defined(CONFIG_OF_BOARD_SETUP) */

The 8260 ft_cpu_setup() seems a bit deficient -- most pertinently, it's
not calling fdt_fixup_memory(), but it's also missing brg frequency setup
and maybe some other things.  Look at other_cpu_setup() functions (e.g.
8xx, 83xx, 85xx) for an example of what to do.

> #define OF_CPU  "PowerPC,8248 at 0"
> #define OF_SOC  "soc at f0000000"
> #define OF_TBCLK        (bd->bi_busfreq / 4)
> #define OF_STDOUT_PATH  "/soc at f0000000/serial at 11a80"

These hardcoded things shouldn't be needed anymore.

> and how to use cuImage.pq2 ?

You'd need to change the makefile to tell it to build that target for
this board.  I recommend fixing u-boot, though, if you're already
inclined to go down that path.

> also i dint get what is dtbImage.ep8248e ? is 
> that same to ep8248e.dtb ??

No, that's an image for the PlanetCore bootloader.  If you don't have it,
you probably built with 'make uImage' rather than 'make zImage'.

-Scott

[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function

[Scott Wood]

On Thu, Apr 24, 2008 at 01:42:42PM +0200, Wolfgang Denk wrote:
> In message <16833978.post@talk.nabble.com> you wrote:
> > 
> > i am trying to bring up the latest kernel on EP8248 target,
> ...
> > Please share your knowledge and skills and help me to resolve this issue..
> 
> I can't help with your Linux kernel problem, but I'm pretty sure that
> it is off topic on this mailing list.

As it turns out, it wasn't off-topic -- the problem is u-boot's fdt
setup for 8260-ish chips.

-Scott

[U-Boot-Users] Kernel hanging after lmb_end_of_DRAM() function

[Wolfgang Denk]

In message <20080428185244.GB14562@ld0162-tx32.am.freescale.net> you wrote:
>
> As it turns out, it wasn't off-topic -- the problem is u-boot's fdt
> setup for 8260-ish chips.

ACK. I stand corrected.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Without facts, the decision cannot be made logically. You  must  rely
on your human intuition.
	-- Spock, "Assignment: Earth", stardate unknown