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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Jules Maselbas <jmaselbas@kalray.eu>, Stafford Horne <shorne@gmail.com>
Cc: Yann Sionneau <ysionneau@kalray.eu>,
	Barebox List <barebox@lists.infradead.org>,
	Sascha Hauer <sha@pengutronix.de>,
	shorne@opencores.org
Subject: Re: nios2 and openrisc in barebox
Date: Thu, 25 Feb 2021 16:33:06 +0100	[thread overview]
Message-ID: <ba82e9ef-9d9a-179c-1688-a9aeb12413d3@pengutronix.de> (raw)
In-Reply-To: <20210225130240.GA5081@tellis.lin.mbt.kalray.eu>

Hello,

On 25.02.21 14:02, Jules Maselbas wrote:
> On Thu, Feb 25, 2021 at 09:45:00PM +0900, Stafford Horne wrote:
>> Hello,
>>
>> I am the maintainer of most OpenRISC things right now.  I would be happy to
>> help, but I don't really use barebox right now.  Most of my deployments I use
>> with litex FPGA SoC's that has its own bootloader.
>>
>> That said, we have a setjmp/longjmp implementation in our glibc port which I
>> have been testing for upstreaming lately.
>>
>>   https://github.com/stffrdhrn/or1k-glibc/blob/or1k-port-2/sysdeps/or1k/setjmp.S
>>   https://github.com/stffrdhrn/or1k-glibc/blob/or1k-port-2/sysdeps/or1k/__longjmp.S
>>
>> I had a look at the barebox docs and openrisc port, it seems like there is
>> support for our standard platform, or1ksim, which is the same as my de0-nano
>> fpga board/soc and qemu.  I should be able to make use of this.
>>
>> Is there a branch where you are doing the green thread work?  I could add and
>> test the OpenRISC implementation.
> Hi,
> 
> I've done this yesterday, I've push a branch[1] that has the green
> thread paches applied (except patches on usb mass storage gadget).
> https://github.com/jmaselbas/barebox/tree/test_setjmp 

Great. Thanks. I'm preparing an updated version that will clean it up
a bit, but the heart part of architectures providing setjmp/longjmp/initjmp
will stay the same.

Small request:
  If you implement initjmp, could you have it save into jmp_buf a frame
  pointer value of NULL if applicable? That way, should backtrace be
  implemented (or done via JTAG), they have a defined end.

Cheers,
Ahmad

> To test greenthread your can run the `poller -c` command in barebox's
> prompt. To do you you'll need to enable CONFIG_POLLER_YIELD and define
> CONFIG_HAS_ARCH_SJLJ
> 
> Best,
> Jules
>  
> 
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

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  reply	other threads:[~2021-02-25 15:34 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23  9:59 Sascha Hauer
2021-02-23 13:13 ` Franck Jullien
2021-02-24  7:06   ` Antony Pavlov
2021-02-24  8:44     ` Sascha Hauer
2021-02-25  7:17 ` Yann Sionneau
2021-02-25 12:45   ` Stafford Horne
2021-02-25 13:02     ` Jules Maselbas
2021-02-25 15:33       ` Ahmad Fatoum [this message]
2021-02-25 17:39         ` Antony Pavlov
2021-02-25 21:12           ` Stafford Horne
2021-03-01 11:05         ` Ahmad Fatoum
2021-03-01 11:17           ` Jules Maselbas
2021-03-01 12:18           ` Stafford Horne

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