Hi,

I have gone through the following link http://www.slideshare.net/linaroorg/lcu14-302-how-to-port-optee-to-another-platform

I have followed each step from slide 9 in the document provided in the above link.

Slide 14 of the document discusses regarding the memory configuration "core_bootconfig.c"

I have configured TZDRAM_BASE, TZDRAM_SIZE, CFG_TEE_CORE_NB_CORE, etc in platform_config.h file.

Do I need to create a core_bootconfig.c file separately? I am using platform device which has an armv7 (cortex A5 processor).

Can I use kern.ld.S file or do I need to create another tz-template.lds as given in slide 10 of the document. Please suggest me on this.

As I am new to op-tee porting please guide me on how to port Op-tee O/s on cortex A5.

Regards,
Ajith

---

From: Jens Wiklander <jens.wiklander@linaro.org>
Sent: Thursday, January 5, 2017 5:05 PM

To: Ajith Kumar Kumsi
Cc: tee-dev@lists.linaro.org
Subject: Re: [Tee-dev] OpTee porting on ARMv7

 

On Thu, Jan 5, 2017 at 12:06 PM, Ajith Kumar Kumsi <ajithkumar.kumsi@inedasystems.com> wrote:

Hi,

I tried to read DFAR and DFSR registers by adding the below code inside _spinlock_loop as shown below:

_spinlock_loop:
    MRC p15, 0, r10, c6, c0, 0
    MRC p15, 0, r9, c5, c0, 0
    ldrex r1, [r0]

In r10 the value is FFFFFFFC

In r9 the value is 8

Any suggestions in this regard.

So DFSR says "Synchronous external abort" and the address is 0xfffffffc. I'm afraid I don't have much to add to that.

Regards,

Jens 

Regards,

Ajith

---

From: Jens Wiklander <jens.wiklander@linaro.org>
Sent: Thursday, January 5, 2017 3:54:51 PM

To: Ajith Kumar Kumsi
Cc: tee-dev@lists.linaro.org
Subject: Re: [Tee-dev] OpTee porting on ARMv7

 

On Thu, Jan 5, 2017 at 10:43 AM, Ajith Kumar Kumsi <ajithkumar.kumsi@inedasystems.com> wrote:

Hi,

Thanks for the quick response.

R0 holds an valid address which belongs to TEE_RAM.

Inside that address the value is 0.

So what's causing the abort then? DFAR and DFSR will give you some clues. Is the address in r0 4 byte aligned? 

Regards,

Jens

Regards,

Ajith

---

From: Jens Wiklander <jens.wiklander@linaro.org>
Sent: Thursday, January 5, 2017 2:55:32 PM

To: Ajith Kumar Kumsi
Cc: tee-dev@lists.linaro.org
Subject: Re: [Tee-dev] OpTee porting on ARMv7

 

Hi,

On Thu, Jan 5, 2017 at 10:11 AM, Ajith Kumar Kumsi
<ajithkumar.kumsi@inedasystems.com> wrote:
> Hi,
>
> While porting Op-tee.elf on ARM A5 board, it is giving a data abort.
>
> I further tried to debug the code, and I could see that in generic_boot.c
> inside "init_runtime" function when malloc_add_pool(__heap1_start,
> __heap1_end - __heap1_start) is called, __mutex_lock is getting called and
> when cpu_spin_lock(&m->spin_lock) is called
> at the below point it gives a data abort exception after "cmp r1,
> #SPINLOCK_UNLOCK".
>
> _spinlock_loop:
>     ldrex r1, [r0]
>     cmp r1, #SPINLOCK_UNLOCK
>     wfene
>
> Can you let me know if I need to make any modifications to make it work.

That piece of code is used by other platforms so I guess the problem
is with the input. What's in r0 would give some clue, because it's
supposed to point ot spinlock within __malloc_mu

Regards,
Jens

>
> Regards,
> Ajith
>
> ________________________________
> From: Jens Wiklander <jens.wiklander@linaro.org>
> Sent: Tuesday, November 29, 2016 6:25:53 PM
> To: Ajith Kumar Kumsi
> Cc: tee-dev@lists.linaro.org
> Subject: Re: [Tee-dev] OpTee porting on ARMv7
>
>
>
> On Tue, Nov 29, 2016 at 1:31 PM, Ajith Kumar Kumsi
> <ajithkumar.kumsi@inedasystems.com> wrote:
>>
>>
>> Hi,
>>
>> Thank you for the reply.
>>
>> As suggested, I have gone through the
>> http://www.slideshare.net/linaroorg/lcu14-302-how-to-port-optee-to-another-platform

LCU14 302- How to port OP-TEE to another platform www.slideshare.net LCU14 302- How to port OP-TEE to another platform ----- Speaker: Joakim Bech, Jens Wiklander and Pascal Brand

>> and https://github.com/OP-TEE/optee_os#3-platforms-supported

GitHub - OP-TEE/optee_os: Trusted side of the TEE github.com The optee_os git, contains the source code for the TEE in Linux using the ARM® TrustZone® technology. This component meets the GlobalPlatform TEE System ...

>>
>> I have downloaded optee_os.
>>
>> I have gone through the other platforms given under
>> "optee_os/core/arch/arm" and created a new platform and modified changes in
>> platform_config.h, conf.mk, main.c, uart.c, uart.h files accordingly related
>> to the new platform (arm7v-a (cortex a5)).
>>
>> I tried to export the platform to the new-platform name and tried to build
>> using "make".
>>
>> I can see that tee.bin got generate in optee_os/out/arm-plat-new/core.
>>
>> I tried to flash tee.elf in to SRAM and I tried to debug using eclipse, I
>> can see that it is getting halted at
>> optee_os/core/arch/arm/kernel/generic_entry_a32.S at line 58.
>>
>>  FUNC _start , :
>>
>>      58         b       .       /* Data abort */
>>
>> Please suggest me on how to proceed further in this regard.
>
>
> Since you've obviously got a data abort I'd suggest checking LR and DFAR for
> more clues to the abort.
>
> Regards,
> Jens
>
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