[RFC] add Tegra support to barebox

[RFC] add Tegra support to barebox

[Antony Pavlov]

Hi!

I have a Toshiba AC100 smartbook. It is based on Nvidia Tegra 250 T20 chip.
I want to port barebox to it.

I have successfully built and run u-boot for AC100 from
https://github.com/chpec/uboot-ac100.git. This u-boot version has lcd,
serial port and USB support.
There is another tegra support u-boot branch:
https://github.com/muromec/uboot-tegra.git
Also linux has satisfactory tegra support.

I want to discuss source file organization for Tegra and AC100 support
in the barebox.
AFAIK tegra is not resemble to current arm machines, supported by barebox.

For example, this is the comment from barebox tegra source code:

/*
 * Tegra2 uses 2 separate CPUs - the AVP (ARM7TDMI) and the CPU (dual A9s).
 * U-Boot runs on the AVP first, setting things up for the CPU (PLLs,
 * muxes, clocks, clamps, etc.). Then the AVP halts, and expects the CPU
 * to pick up its reset vector, which points here.
 */

I propose such file structure:

  arch/arm/
  arch/arm/boards/toshiba_ac100
  arch/arm/mach-tegra

Has anybody any objections or comments?

-- 
Best regards,
  Antony Pavlov

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Re: [RFC] add Tegra support to barebox

[Jean-Christophe PLAGNIOL-VILLARD]

On 00:24 Thu 11 Aug     , Antony Pavlov wrote:
> Hi!
> 
> I have a Toshiba AC100 smartbook. It is based on Nvidia Tegra 250 T20 chip.
> I want to port barebox to it.
> 
> I have successfully built and run u-boot for AC100 from
> https://github.com/chpec/uboot-ac100.git. This u-boot version has lcd,
> serial port and USB support.
> There is another tegra support u-boot branch:
> https://github.com/muromec/uboot-tegra.git
> Also linux has satisfactory tegra support.
> 
> I want to discuss source file organization for Tegra and AC100 support
> in the barebox.
> AFAIK tegra is not resemble to current arm machines, supported by barebox.
> 
> For example, this is the comment from barebox tegra source code:
> 
> /*
>  * Tegra2 uses 2 separate CPUs - the AVP (ARM7TDMI) and the CPU (dual A9s).
>  * U-Boot runs on the AVP first, setting things up for the CPU (PLLs,
>  * muxes, clocks, clamps, etc.). Then the AVP halts, and expects the CPU
>  * to pick up its reset vector, which points here.
>  */
> 
> I propose such file structure:
> 
>   arch/arm/
>   arch/arm/boards/toshiba_ac100
>   arch/arm/mach-tegra
> 
> Has anybody any objections or comments?
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

Best Regards,
J.

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Re: [RFC] add Tegra support to barebox

[Antony Pavlov]

On 11 August 2011 00:24, Antony Pavlov <antonynpavlov@gmail.com> wrote:

> AFAIK tegra is not resemble to current arm machines, supported by barebox.
>
> For example, this is the comment from barebox tegra source code:

Sorry, of cause, this is a comment from __U-Boot__ tegra source code:

> /*
>  * Tegra2 uses 2 separate CPUs - the AVP (ARM7TDMI) and the CPU (dual A9s).
>  * U-Boot runs on the AVP first, setting things up for the CPU (PLLs,
>  * muxes, clocks, clamps, etc.). Then the AVP halts, and expects the CPU
>  * to pick up its reset vector, which points here.
>  */


-- 
Best regards,
  Antony Pavlov

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Re: [RFC] add Tegra support to barebox

[Sascha Hauer]

On Thu, Aug 11, 2011 at 12:24:27AM +0400, Antony Pavlov wrote:
> Hi!
> 
> I have a Toshiba AC100 smartbook. It is based on Nvidia Tegra 250 T20 chip.
> I want to port barebox to it.
> 
> I have successfully built and run u-boot for AC100 from
> https://github.com/chpec/uboot-ac100.git. This u-boot version has lcd,
> serial port and USB support.
> There is another tegra support u-boot branch:
> https://github.com/muromec/uboot-tegra.git
> Also linux has satisfactory tegra support.
> 
> I want to discuss source file organization for Tegra and AC100 support
> in the barebox.
> AFAIK tegra is not resemble to current arm machines, supported by barebox.
> 
> For example, this is the comment from barebox tegra source code:
> 
> /*
>  * Tegra2 uses 2 separate CPUs - the AVP (ARM7TDMI) and the CPU (dual A9s).
>  * U-Boot runs on the AVP first, setting things up for the CPU (PLLs,
>  * muxes, clocks, clamps, etc.). Then the AVP halts, and expects the CPU
>  * to pick up its reset vector, which points here.
>  */

Does this mean you have to build two U-Boot binaries? How big is the
code that runs on the AVP?

> 
> I propose such file structure:
> 
>   arch/arm/
>   arch/arm/boards/toshiba_ac100
>   arch/arm/mach-tegra
> 
> Has anybody any objections or comments?

This is the standard file structure, so no objections here.

Sascha


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Re: [RFC] add Tegra support to barebox

[Antony Pavlov]

On 11 August 2011 10:25, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Thu, Aug 11, 2011 at 12:24:27AM +0400, Antony Pavlov wrote:
>> Hi!
>>
>> I have a Toshiba AC100 smartbook. It is based on Nvidia Tegra 250 T20 chip.
>> I want to port barebox to it.
>>
>> I have successfully built and run u-boot for AC100 from
>> https://github.com/chpec/uboot-ac100.git. This u-boot version has lcd,
>> serial port and USB support.
>> There is another tegra support u-boot branch:
>> https://github.com/muromec/uboot-tegra.git
>> Also linux has satisfactory tegra support.
>>
>> I want to discuss source file organization for Tegra and AC100 support
>> in the barebox.
>> AFAIK tegra is not resemble to current arm machines, supported by barebox.
>>
>> For example, this is the comment from barebox tegra source code:
>>
>> /*
>>  * Tegra2 uses 2 separate CPUs - the AVP (ARM7TDMI) and the CPU (dual A9s).
>>  * U-Boot runs on the AVP first, setting things up for the CPU (PLLs,
>>  * muxes, clocks, clamps, etc.). Then the AVP halts, and expects the CPU
>>  * to pick up its reset vector, which points here.
>>  */
>
> Does this mean you have to build two U-Boot binaries?
AFAIK, no.

> How big is the code that runs on the AVP?
I can't say it just now.

-- 
Best regards,
  Antony Pavlov

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