From: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> At least some ath79 SoC have build in 32K RAM. It allow us to use lowlevel portion of barebox for OpenOCD and reduce code duplication between this projects. The workflow should be as follow: - Load reduced barebox to SRAM by using OpenOCD and execute it. This part will do all needed low level initialization - PLL, RAM. - Load complete barebox to the main RAM (DDR or what ever technology is used). It can be used for recovery and for bring-up, so no flashing is needed. Signed-off-by: Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> --- arch/mips/mach-ath79/Makefile | 1 + .../mips/mach-ath79/include/mach/pbl_macros.h | 21 +++++++++++++++++++ arch/mips/mach-ath79/lowlevel_ar9331_sram.S | 18 ++++++++++++++++ images/Makefile.ath79 | 4 ++++ 4 files changed, 44 insertions(+) create mode 100644 arch/mips/mach-ath79/lowlevel_ar9331_sram.S diff --git a/arch/mips/mach-ath79/Makefile b/arch/mips/mach-ath79/Makefile index c12444ff47..396df66bf1 100644 --- a/arch/mips/mach-ath79/Makefile +++ b/arch/mips/mach-ath79/Makefile @@ -1,4 +1,5 @@ lwl-y += lowlevel_ar9331_spi_trap.o +lwl-y += lowlevel_ar9331_sram.o obj-y += reset.o obj-y += bbu.o diff --git a/arch/mips/mach-ath79/include/mach/pbl_macros.h b/arch/mips/mach-ath79/include/mach/pbl_macros.h index 70736b3680..c5f3d4150e 100644 --- a/arch/mips/mach-ath79/include/mach/pbl_macros.h +++ b/arch/mips/mach-ath79/include/mach/pbl_macros.h @@ -400,4 +400,25 @@ skip_pll_ram_config: .set pop .endm + .macro ar9331_pbl_generic_sram_start + .set push + .set noreorder + + mips_barebox_10h + + hornet_mips24k_cp0_setup + + hornet_1_1_war + + pbl_ar9331_pll + pbl_ar9331_ram_generic_config + + pbl_ar9331_uart_enable + debug_ll_ath79_init + + pbl_ar9331_mdio_gpio_enable + + .set pop + .endm + #endif /* __ASM_MACH_ATH79_PBL_MACROS_H */ diff --git a/arch/mips/mach-ath79/lowlevel_ar9331_sram.S b/arch/mips/mach-ath79/lowlevel_ar9331_sram.S new file mode 100644 index 0000000000..7c25d8765c --- /dev/null +++ b/arch/mips/mach-ath79/lowlevel_ar9331_sram.S @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Oleksij Rempel <linux@xxxxxxxxxxxxxxxx> + */ + +#define BOARD_PBL_START start_ar9331_sram + +#include <mach/debug_ll.h> +#include <asm/asm.h> +#include <asm/pbl_macros.h> +#include <mach/pbl_macros.h> +#include <asm/pbl_nmon.h> + +ENTRY_FUNCTION(BOARD_PBL_START) + + ar9331_pbl_generic_sram_start + +ENTRY_FUNCTION_SRAM_END diff --git a/images/Makefile.ath79 b/images/Makefile.ath79 index 181f951595..5dda411d8f 100644 --- a/images/Makefile.ath79 +++ b/images/Makefile.ath79 @@ -2,6 +2,10 @@ pblb-$(CONFIG_SOC_QCA_AR9331) += start_ar9331_spi_trap FILE_barebox-ar9331-spi-trap.img = start_ar9331_spi_trap.pblb image-$(CONFIG_SOC_QCA_AR9331) += barebox-ar9331-spi-trap.img +pblb-$(CONFIG_SOC_QCA_AR9331) += start_ar9331_sram +FILE_barebox-ar9331-sram.img = start_ar9331_sram.pblb +image-$(CONFIG_SOC_QCA_AR9331) += barebox-ar9331-sram.img + pblb-$(CONFIG_BOARD_8DEVICES_LIMA) += start_8devices_lima FILE_barebox-8devices-lima.img = start_8devices_lima.pblb image-$(CONFIG_BOARD_8DEVICES_LIMA) += barebox-8devices-lima.img -- 2.20.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
