[POWERPC] Add kernel parameter to set l3cr for MPC745x
Old-world powermacs don't set L2CR or L3CR on processor upgrade cards. This simple patch allows the setting of L3CR via a kernel parameter (like the existing kernel parameter to set L2CR). Signed-off-by: NRobert Brose <bob@qbjnet.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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