From eeb09917c138ccd6d9a1c8410891ca2fa5feb5ea Mon Sep 17 00:00:00 2001 From: Bai Yingjie Date: Mon, 6 Jan 2020 12:29:54 +0800 Subject: [PATCH] powerpc/mpc85xx: also write addr_h to spin table for 64bit boot entry CPU like P4080 has 36bit physical address, its DDR physical start address can be configured above 4G by LAW registers. For such systems in which their physical memory start address was configured higher than 4G, we need also to write addr_h into the spin table of the target secondary CPU, so that addr_h and addr_l together represent a 64bit physical address. Otherwise the secondary core can not get correct entry to start from. Signed-off-by: Bai Yingjie Acked-by: Scott Wood Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200106042957.26494-2-yingjie_bai@126.com --- arch/powerpc/platforms/85xx/smp.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/powerpc/platforms/85xx/smp.c b/arch/powerpc/platforms/85xx/smp.c index 8c7ea24..48f7d96 100644 --- a/arch/powerpc/platforms/85xx/smp.c +++ b/arch/powerpc/platforms/85xx/smp.c @@ -252,6 +252,15 @@ static int smp_85xx_start_cpu(int cpu) out_be64((u64 *)(&spin_table->addr_h), __pa(ppc_function_entry(generic_secondary_smp_init))); #else +#ifdef CONFIG_PHYS_ADDR_T_64BIT + /* + * We need also to write addr_h to spin table for systems + * in which their physical memory start address was configured + * to above 4G, otherwise the secondary core can not get + * correct entry to start from. + */ + out_be32(&spin_table->addr_h, __pa(__early_start) >> 32); +#endif out_be32(&spin_table->addr_l, __pa(__early_start)); #endif flush_spin_table(spin_table); -- 2.7.4