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    SubjectRe: [PATCH v2 11/25] powerpc/8xx: map 16M RAM at startup
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    Le 29/09/2015 01:58, Scott Wood a écrit :
    > On Tue, Sep 22, 2015 at 06:50:50PM +0200, Christophe Leroy wrote:
    >> On recent kernels, with some debug options like for instance
    >> CONFIG_LOCKDEP, the BSS requires more than 8M memory, allthough
    >> the kernel code fits in the first 8M.
    >> Today, it is necessary to activate CONFIG_PIN_TLB to get more than 8M
    >> at startup, allthough pinning TLB is not necessary for that.
    >>
    >> This patch adds a second 8M page to the initial mapping in order to
    >> have 16M mapped regardless of CONFIG_PIN_TLB, like several other
    >> 32 bits PPC (40x, 601, ...)
    >>
    >> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
    >> ---
    > Is the assumption that nobody is still running 8xx systems with only 8
    > MiB RAM on current kernels?
    >
    >
    No, setup_initial_memory_limit() limits the memory to the minimum
    between 16M and the real memory size, so if a platform has only 8M, it
    will still be limited to 8M even with 16M mapped.

    Christophe


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