The ELPA bit needs to be set in the PAGEGRAIN register to enable access to >64GB physical address. Update reset.S to do this from every hardware thread. Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx> --- arch/mips/netlogic/common/reset.S | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/arch/mips/netlogic/common/reset.S b/arch/mips/netlogic/common/reset.S index fda772a..13c1bc5 100644 --- a/arch/mips/netlogic/common/reset.S +++ b/arch/mips/netlogic/common/reset.S @@ -74,6 +74,18 @@ .endm /* + * Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN + * register. This is needed before going to C code since the SP can + * in this region. Called from all HW threads. + */ +.macro xlp_early_mmu_init + mfc0 t0, CP0_PAGEMASK, 1 + li t1, (1 << 29) /* ELPA bit */ + or t0, t1 + mtc0 t0, CP0_PAGEMASK, 1 +.endm + +/* * L1D cache has to be flushed before enabling threads in XLP. * On XLP8xx/XLP3xx, we do a low level flush using processor control * registers. On XLPII CPUs, usual cache instructions work. @@ -228,6 +240,8 @@ EXPORT(nlm_boot_siblings) #endif mtc0 t1, CP0_STATUS + xlp_early_mmu_init + /* mark CPU ready */ li t3, CKSEG1ADDR(RESET_DATA_PHYS) ADDIU t1, t3, BOOT_CPU_READY @@ -254,6 +268,7 @@ EXPORT(nlm_reset_entry_end) LEAF(nlm_init_boot_cpu) #ifdef CONFIG_CPU_XLP xlp_config_lsu + xlp_early_mmu_init #endif jr ra nop -- 1.7.9.5
