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    SubjectRe: Making ARM multiplatform kernels DT-only?
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    Russell King - ARM Linux <linux@arm.linux.org.uk> writes:

    Hi,

    > On Thu, May 03, 2012 at 01:50:35PM +0000, Arnd Bergmann wrote:
    >> My feeling is that we should just mandate DT booting for multiplatform
    >> kernels, because it significantly reduces the combinatorial space
    >> at compile time, avoids a lot of legacy board files that we cannot
    >> test anyway, reduces the total kernel size and gives an incentive
    >> for people to move forward to DT with their existing boards.
    >
    > On this point, I strongly object, especially as I'm one who uses the
    > existing non-DT multiplatform support extensively. It's really not
    > a problem for what you're trying to achieve.
    >

    Please, don't do this. afaik, the idea was to reduce the numbers of
    kernel to deal with. Unfortunately, this kind of restriction would
    increase it. Consider orion platforms. This would mean having to deal
    with 4 kernels (1 for DT, 1 for orion5x, 1 for kirkwood, 1 for mv78xx0).

    Dropping HW support because one wants to encourage people to convert
    their board file into DT seems weird. Doing this, imho, should even be
    called a regression. The DT conversion won't happen in an eye blink so
    non-DT kernels are still something we should take care of.

    > I think what you're proposing is a totally artificial restriction.
    > There's no problem with a kernel supporting DT and non-DT together.
    > We've proven that many many times. I prove it _every_ night that my
    > build and boot system runs - the OMAP LDP boots a multiplatform kernel
    > just fine without DT.

    I think it's true for imx too. iirc, one can build a single image for
    armv4/armv5 and one other for armv6/armv7 without having to use DT.

    Regards,
    Arnaud


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