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. AR9331 (Hornet) 1.1 currently needs an additional reset at 1st boot. This patch imports necessary 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 | 43 ++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/arch/mips/mach-ath79/include/mach/pbl_macros.h b/arch/mips/mach-ath79/include/mach/pbl_macros.h index 810f49d..24cfd60 100644 --- a/arch/mips/mach-ath79/include/mach/pbl_macros.h +++ b/arch/mips/mach-ath79/include/mach/pbl_macros.h @@ -223,4 +223,47 @@ .set pop .endm +.macro hornet_1_1_war + .set push + .set noreorder + +/* + * WAR: Hornet 1.1 currently need a reset once we boot to let the resetb has + * enough time to stable, so that trigger reset at 1st boot, system team + * is investigaing the issue, will remove in short + */ + + li t7, 0xbd000000 + lw t8, 0(t7) + li t9, 0x12345678 + + /* if value of 0xbd000000 != 0x12345678, go to do_reset */ + bne t8, t9, do_reset + nop + + li t9, 0xffffffff + sw t9, 0(t7) + b normal_path + nop + +do_reset: + /* put 0x12345678 into 0xbd000000 */ + sw t9, 0(t7) + + /* reset register 0x1806001c */ + li t7, 0xb806001c + lw t8, 0(t7) + /* bit24, fullchip reset */ + li t9, 0x1000000 + or t8, t8, t9 + sw t8, 0(t7) + +do_reset_loop: + b do_reset_loop + nop + +normal_path: + .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
