U-Boot_mod is a popular bootloader for Atheros AR93xx chips, please see https://github.com/pepe2k/u-boot_mod for details. It's reasonable to import some lowlevel AR9331 initialization code from U-Boot_mod. This patch imports AR9331 MIPS24K coprocessor0 initialization code from u-boot_mod/u-boot/cpu/mips/start_bootstrap.S. Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx> --- arch/mips/mach-ath79/include/mach/pbl_macros.h | 44 ++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/arch/mips/mach-ath79/include/mach/pbl_macros.h b/arch/mips/mach-ath79/include/mach/pbl_macros.h index c00dd28..810f49d 100644 --- a/arch/mips/mach-ath79/include/mach/pbl_macros.h +++ b/arch/mips/mach-ath79/include/mach/pbl_macros.h @@ -179,4 +179,48 @@ | AR933X_GPIO_FUNC_RSRV15, GPIO_FUNC .endm +.macro hornet_mips24k_cp0_setup + .set push + .set noreorder + + /* + * Clearing CP0 registers - This is generally required for the MIPS-24k + * core used by Atheros. + */ + mtc0 zero, CP0_INDEX + mtc0 zero, CP0_ENTRYLO0 + mtc0 zero, CP0_ENTRYLO1 + mtc0 zero, CP0_CONTEXT + mtc0 zero, CP0_PAGEMASK + mtc0 zero, CP0_WIRED + mtc0 zero, CP0_INFO + mtc0 zero, CP0_COUNT + mtc0 zero, CP0_ENTRYHI + mtc0 zero, CP0_COMPARE + + li t0, ST0_CU0 | ST0_ERL + mtc0 t0, CP0_STATUS + + mtc0 zero, CP0_CAUSE + mtc0 zero, CP0_EPC + + li t0, CONF_CM_UNCACHED + mtc0 t0, CP0_CONFIG + + mtc0 zero, CP0_LLADDR + mtc0 zero, CP0_WATCHLO + mtc0 zero, CP0_WATCHHI + mtc0 zero, CP0_XCONTEXT + mtc0 zero, CP0_FRAMEMASK + mtc0 zero, CP0_DIAGNOSTIC + mtc0 zero, CP0_DEBUG + mtc0 zero, CP0_DEPC + mtc0 zero, CP0_PERFORMANCE + mtc0 zero, CP0_ECC + mtc0 zero, CP0_CACHEERR + mtc0 zero, CP0_TAGLO + + .set pop +.endm + #endif /* __ASM_MACH_ATH79_PBL_MACROS_H */ -- 2.7.0 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
