Re: [crosstool-ng/crosstool-ng] bc9ed3: Adds Raspberry Pi 3 sample config

[Bryan Hundven <bryanhundven at gmail dot com>]

> On Mar 3, 2016, at 4:45 AM, Bryan Hundven <bryanhundven@gmail.com> wrote:
> 
> 
>> On Mar 2, 2016, at 10:23 PM, Mike Ray <mike@raspberryvi.org> wrote:
>> 
>> Hello.
>> 
>> Good to know it's not just me being an idiot!  I was hoping to use a
>> toolchain generated with ct-ng to build a 64-bit root file-system using
>> buildroot or just using the toolchain with cross-LFS.
> 
> Indeed! Thatâs the spirit! :)
> 
>> 
>> I will continue to tinker and at the same time wait to see if there are
>> changes to this sample.
> 
> There may only be one change to the sample, one line added, but the real change will happen in two files (maybe 3). And really, they arenât big changes.
> 
>> 
>> It's true that at the moment there are only 32-bit images available.  I
>> expect ArchARM to come up with a 64-bit image soon enough though.
> 
> Indeed, but someone has to push the edge and give it a go?
> 
> I need to get myself a PI3. I have to wait till the 15th to order mine, but that doesnât mean I canât start getting ct-ng there. I know there are others out there waiting for aarch64 support, so letâs do this.
> 
>> 
>> Mike
> 
> Cheers,
> 
> -Bryan

Well, I feel like I totally missed the mark yesterday. I didnât realize RPI3 was a 64-bit cpu, and I assumed ct-ng did not have aarch64 support. 0/2â

On the plus side, I have something to test:
https://github.com/crosstool-ng/crosstool-ng/pull/362

Now, the hard part. You canât run 64-bit binaries on 32-bit.
Also, Iâm not sure if you can boot aarch64 from a 32-bit bootloader?
So you may have to start with making u-boot?

I wish I had an RPI3, so I could help with that, but for now Iâll just have to be patient and wait to hear your progress. If you do make progress, and need help, post a git repo somewhere and Iâll try to help if I can.

-Bryan

> 
>> 
>> 
>> On 03/03/2016 00:28, Stefan Hallas Mulvad wrote:
>>> Hi Bryan,
>>> 
>>> I did test this, but at this time thereâs (to my knowledge) no os images available which supports 64 bit. Mine came with 32 bit raspbian,
>>> 
>>> The chip is capable of running in both 32/64 bit mode - but 64 bit must come down the road as software becomes available.
>>> 
>>> Best regards,
>>> Stefan Mulvad
>>> 
>>> 
>>>> On Mar 2, 2016, at 4:22 PM, Bryan Hundven <bryanhundven@gmail.com> wrote:
>>>> 
>>>> Hello Mike,
>>>> 
>>>> 
>>>>> On Mar 2, 2016, at 3:51 PM, Mike Ray <mike@raspberryvi.org> wrote:
>>>>> 
>>>>> Hello.
>>>>> 
>>>>> I have used this sample to build a toolchain.
>>>>> 
>>>>> However I get 32-bit executables and the '-m64' switch is not recognized.
>>>> 
>>>> Sometimes, I expect that when people open pull-requests that they actually test what they submit and I donât have to do any work.
>>>> 
>>>> Today I failed at that. Yeay!
>>>> 
>>>> Arm64/aarch64 is kind of a new thing in crosstool-NG, and isnât well supported.
>>>> 
>>>> I took the pull-request for the sample without looking at the specs for the new raspberry pi 3. I had no clue it was 64-bit.
>>>> 
>>>> Looks like I will have to take some time and get this going.
>>>> 
>>>>> 
>>>>> There is obviously a gap in my knowledge which I can't seem to find an
>>>>> answer for on Google.
>>>>> 
>>>>> Can I compile a 64-bit executable?  If so, how?
>>>>> 
>>>>> Thanks for any help.
>>>>> 
>>>>> Mike
>>>>> 
>>>>> 
>>>> 
>>>> Thanks for reporting this issue!
>>>> 
>>>> https://github.com/crosstool-ng/crosstool-ng/issues/361
>>>> 
>>>> Cheers,
>>>> 
>>>> -Bryan
>>> 
>> 
>> 
>> --
>> Michael A. Ray
>> Analyst/Programmer
>> Witley, Surrey, South-east UK
>> 
>> Eyes-free Linux:
>> http://eyesfreelinux.ninja/
>> 
>> Raspberry VI:
>> http://www.raspberryvi.org/
>> 
>> 
>> --
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>> 
>

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