• Paul Mackerras's avatar
    powerpc: Sync RPA note in zImage with kernel's RPA note · 91a00302
    Paul Mackerras authored
    Commit 9b09c6d9 ("powerpc: Change the
    default link address for pSeries zImage kernels") changed the
    real-base value in the CHRP note added by the addnote program from
    12MB to 32MB to give more space for Open Firmware to load the zImage.
    (The real-base value says where we want OF to position itself in
    memory.)  However, this change was ineffective on most pSeries
    machines, because the RPA note added by addnote has the "ignore me"
    flag set to 1.  This was intended to tell OF to ignore just the RPA
    note, but has the side effect of also making OF ignore the CHRP note
    (at least on most pSeries machines).
    
    To solve this we have to set the "ignore me" flag to 0 in the RPA
    note.  (We can't just omit the RPA note because that is equivalent to
    having an RPA note with default values, and the default values are not
    what we want.)  However, then we have to make sure the values in the
    zImage's RPA note match up with the values that the kernel supplies
    later in prom_init.c with either the ibm,client-architecture-support
    call or the process-elf-header call in prom_send_capabilities().
    
    So this sets the "ignore me" flag in the RPA note in addnote to 0, and
    adjusts the RPA note values in addnote.c and in prom_init.c to be
    consistent with each other and with the values in ibm_architecture_vec.
    
    However, since the wrapper is independent of the kernel, this doesn't
    ensure that the notes will stay consistent.  To ensure that, this adds
    code to addnote.c so that it can extract the kernel's RPA note from
    the kernel binary and put that in the zImage.  To that end, we put the
    kernel's fake ELF header (which contains the kernel's RPA note) into
    its own section, and arrange for wrapper to pull out that section with
    objcopy and pass it to addnote, which then extracts the RPA note from
    it and transfers it to the zImage.
    Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    91a00302
vmlinux.lds.S 6.08 KB