[Buildroot] [PATCH] configs: add defconfig for Freescale i.MX31 PDK
Arnout Vandecappelle
arnout at mind.be
Thu Mar 19 21:26:46 UTC 2015
On 19/03/15 16:37, Vincent Stehlé wrote:
> On 03/19/2015 12:32 AM, Arnout Vandecappelle wrote:
> ..
>> Doesn't the upstream MACH_MX31_3DS work? 2.6.28 is extremely old...
>
> Hi Arnout,
>
> Thank you for reviewing this patch so quickly and sending
> feedbacks.
>
> This defconfig is indeed based on an old 2.6.28 kernel; the idea
> was to base the defconfig on the last Freescale "official"
> release, which works fine for me.
>
> You are right that mainline kernel has support for the i.MX31
> processor, but there is no dts in there for the i.MX31 PDK right
> now. The few tries I just did do not boot "as is" but I will
> continue a bit.
It doesn't look like it's using DT, but there's a mach-mx31_3ds.c that uses the
old platform approach. Of course your bootloader has to set the correct machine
ID (1151) in that case.
> Do you insist that this i.MX31 config uses mainline, or would
> it be acceptable to stay on the "old", Freescale "official"
> kernel?
If there's no other way it's acceptable, but it's really not nice. And the
headers issue definitely has to be fixed.
>>> +BR2_KERNEL_HEADERS_3_2=y
>> That doesn't sound like a good idea when the kernel is 2.6.28...
>
> Granted, this is not optimal. Those are the kernel headers
> closest to 2.6.28, "easily" available in buildroot.
>
> It is indeed possible to manually specify the 2.6.28 kernel
> headers version, but this necessitates two patches to fix the
> linux-headers "build".
> Do you prefer this solution?
Not really :-)
[snip]
>> If network boot is really the only option, then perhaps it would be nicer to
>> use an initramfs linked into the kernel? Or doesn't the board have enough memory
>> to support that?
>
> This is my only boot method for the moment.
> Do you insist that the defconfig should use MMC?
No, MMC is not that much better since not many PCs can access it anyway.
> I will continue to try a bit to generate a suitable MMC with
> buildroot anyway. Maybe that can be changed in the defconfig later
> on?
>
> On the other hand, if we stay with network booting, initramfs is
> a nice idea as it makes the setup simpler indeed. Also, the
> i.MX31 PDK has 128 MB of memory, so this is a practical solution.
> I just tested and an initramfs included in the zImage works
> fine. Only, Freescale "official" kernel has no support for
> initrd/initramfs, so we need another patch.
Er, you say that initramfs works but it isn't supported? WTF?
Regards,
Arnout
> Would you prefer this solution?
>
> I will send a v2 patch right away, with a few reworks discussed
> here, and still based on the "old" Freescale "official" release.
> Please let me know if this is going in the right direction (or
> not ;)
>
> Thanks again for reviewing!
>
> Best regards,
>
> V.
>
>
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286500
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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