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    SubjectRe: [uClinux-dev] [PATCH/RFC] FDPIC: add hook for arches to customize program header parsing
    Mike Frysinger wrote:
    > On Sat, Jun 13, 2009 at 12:13, Jamie Lokier wrote:
    > > Mike Frysinger wrote:
    > >> From: Jie Zhang <jie.zhang@analog.com>
    > >>
    > >> The Blackfin port has custom program header flags/addresses for
    > >> automatically loading regions into the dedicated on-chip SRAM.  So add a
    > >> hook for ports to leverage.
    > >
    > > What does this have to do with FDPIC?  I don't see anything that is
    > > specific to FDPIC about this code, other than FDPIC being the type of
    > > ELF used on Blackfin.  If an MMU were added to some future Blackfins,
    > > wouldn't this code be used for non-FDPIC ELF too?
    >
    > no, because with a MMU, the memory would be virtualized and we could
    > handle it dynamically

    Wouldn't you still want to put some things into local L1 SRAM, using thos, perhaps by
    flagging it instead of

    > > It looks like a way for certain special executables to load themselves
    > > into fixed regions of the on-chip SRAM - and promptly crash if another
    > > executable does the same.  Not so much a general executable format, as
    > > a hack to load something specific which should only be done once at a
    > > time.  What am I missing here?
    >
    > the addresses are keys, not fixed and/or "real" addresses

    Oh, I see that is indeed quite nice :-)

    I see it checks for both flags and special address values. Are the
    special address checks mainly historical, as usually flags/types are
    used to designate special memory types in ELF.

    Anyway,

    Acked-By: Jamie Lokier <jamie@shareable.org>

    -- Jamie
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