Re: support of arm64 architecture

["Raphaël Poggi" <poggi.raph@gmail.com>]

Hi,

Thank you for your answer.

At the beginning, I have tried to add arm64 specific code on the arm
architecture folder, but it becomes a mess...

Nevertheless, I can give an another try with this solution and then we
can decide.

2016-04-08 19:30 GMT+02:00 Sascha Hauer <s.hauer@pengutronix.de>:
> Hi Raphaël,
>
> On Fri, Apr 08, 2016 at 02:01:21PM +0200, Raphaël Poggi wrote:
>> Hi all,
>>
>> I am working on porting barebox on arm64 architecture.
>>
>> So I have some questions about it:
>>
>> - Is there any interest for barebox to support this architecture ?
>
> Definitely, yes.
>
>>
>> - My port is running at EL1 for the moment, does the bootloader have
>> to run at EL3 ? If yes, do you have hint to achieve this ?
>>       I think UEFI is running at EL3, but I am confused about that,
>> what is the difference between UEFI and barebox ? Are they both
>> booloader ? (I guess it is a "noob" question :/)
>
> UEFI is an interface to the firmware whereas barebox is a firmware. We
> could implement a UEFI interface for barebox (the U-Boot guys already
> did this). Also barebox can run on top of firmware with a (U)Efi
> interface.
>
>>
>> - I have some issues with malloc, when I use tlsf all malloc failed,
>> but not with dlmalloc implementation, do you have an idea about this ?
>
> Do you have TLSF_64BIT defined? You may have defined it automatically
> when you have CONFIG_64BIT defined, but if not tlsf malloc will not
> work.
>
>>
>>
>> At the moment the current limitations of my port are :
>>      - MMU not implemented
>>      - barebox running at EL1
>>      - barebox env not working
>>      - only test on qemu
>>
>> If you want to test it:
>> https://github.com/raphui/barebox/tree/dev/armv8a_cleanup
>
> From a first look it the arm64 code looks very familiar. Do you think we
> could merge it into the arm architecture rather than creating a new
> architecture?
>
> I don't know in which exception level barebox should finally run in, but
> I don't think that's a showstopper.
>
> Sascha
>
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