linux-kernel - Re: [PATCH] RFC: arm: eBPF JIT compiler

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Message-ID: <b5191e43-c8d8-6d9b-8c0f-afb31388e0c5@gmail.com>
Date:   Thu, 25 May 2017 14:12:30 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Shubham Bansal <illusionist.neo@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Russell King - ARM Linux <linux@...linux.org.uk>
Subject: Re: [PATCH] RFC: arm: eBPF JIT compiler

On 05/25/2017 01:08 PM, Shubham Bansal wrote:
> Hi Florian,
> 
> It would be great if you could help me with it.
> 
> Currently, what I am doing is.
> 
>  root@...$ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make -j4
> 
> Then I am using Busybox to build the root filesystem
> 
> root@...$ qemu-system-arm -M vexpress-a9 -dtb
> ./linux/arch/arm/boot/dts/vexpress-v2p-ca9.dtb -kernel
> ./linux/arch/arm/boot/zImage -append "root=/dev/mmcblk0
> console=ttyAMA0" -sd ./a9rootfs.ext3 --nographic
> 
> Which machine I should use for ARMv6 in QEMU. Which dtb file I should
> use for ? All these questions I have. If anybody knows please let me
> know.

You should use realview-eb-mpcore for instance (ARM11MPCORE is ARMv6).

> 
> 
> Best,
> Shubham Bansal
> 
> 
> On Fri, May 26, 2017 at 1:14 AM, Florian Fainelli <f.fainelli@...il.com> wrote:
>> On 05/25/2017 12:09 PM, Shubham Bansal wrote:
>>> Hi Andrew,
>>>
>>> On Fri, May 26, 2017 at 12:18 AM, Andrew Lunn <andrew@...n.ch> wrote:
>>>> On Fri, May 26, 2017 at 12:05:23AM +0530, Shubham Bansal wrote:
>>>>> Hi Andrew,
>>>>>
>>>>> My Apologies.
>>>>>
>>>>> I will remove the #ifdef CONFIG_CPU_LITTLE_ENDIAN. Do you have the
>>>>> ARMv6 machine you can test it on?
>>>>
>>>> Sorry, i don't have a v6.
>>>>
>>>> Maybe try kzm with qemu-system-qemu?
>>>
>>> I am afraid I not so familiar with qemu, otherwise I would have tried
>>> to test the code on ARMv5,6,7 myself.
>>> If you can help me with that it would be great, Otherwise I think I
>>> have to wait for someone to test it for ARMv6. Although, I am pretty
>>> sure it would work on that as it worked on ARMv5.
>>
>> Using QEMU is far less complex than the patch you wrote, the tricky
>> point me be to find an ARMv6 root filesystem, unless you build the
>> module into the kernel and let it run its tests.
>> --
>> Florian


-- 
Florian