Bootstrap process of u boot (NDS32 RISC CPU)

The bootstrap procedure of u-boot. Take NDS32 architecture as an example. Macpaul Lin macpaul <at> gmail.com 2012/Jan/10

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CPU (SoC) DRAM FLASH ROM

How to pack a boot loader? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],.TEXT .rodata .got .data .u_boot_cmd .bss 0x00000000, _start

How to pack a boot loader? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],.TEXT .rodata .got .data .u_boot_cmd .bss CONFIG_SYS_TEXT_BASE, _start FLASH/ROM DRAM AHB Controller Reserved SMC Controller DMA Controller Reserved ... 0x00000000

How to pack a boot loader? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],.TEXT _TEXT_BASE IRQ_STACK_START_IN ... 0x0000 0000 ... 0xdec0 ad0b ... ...

Overview – The bootstrap procedure Reset CPU and Hardware Setup SP for Early Board Setup Environment (ASM->C) Early Board Setup board_init_f() Relocation Setup SP for Common Board Setup Setup GD and JUMP to Final Board Setup Common Board Setup board_init_r() Jump into Main loop Low Level Initialization Setup Memory Memory REMAP Setup Memory Controller or on-chip SRAM

Overview – The bootstrap procedure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overview – The bootstrap procedure Setup SP for Early Board Setup Environment (ASM->C) Setup SP for Common Board Setup Setup GD and JUMP to Final Board Setup Reset CPU and Hardware Setup Vector Early Board Setup board_init_f() Early Devices Setup Calculate Addresses (SP, Dest, GD) for Relocation General Relocation Copy Binary to RAM Fix Relocation Fix GOT Clear BSS Common Board Setup board_init_r() Setup Mem for dlmalloc() Setup Board Data Setup Board FLASH Load Default Environments Setup Environment env_relocate(); Jump into Main loop Setup SoC and Board Specific Devices board_init() Low Level Initialization Turnoff Watchdog Setup Memory Memory REMAP Setup Memory Controller or on-chip SRAM

Overview – The bootstrap procedure cpu/n1213/start.S Setup Vector cpu/n1213/start.S Setup SP for Early Board Setup Environment (ASM->C) lib/board.c board_init_f() Early Devices Setup Calculate Addresses (SP, Dest, GD) for Relocation cpu/n1213/start.S Copy Binary to RAM Fix Relocation Fix GOT Clear BSS cpu/n1213/start.S Setup SP for Common Board Setup cpu/n1213/start.S Setup GD & Final Setup lib/board.c board_init_r() Setup Mem for dlmalloc() Setup Board Data Setup Board FLASH Load Default Environments Setup Environment env_relocate(); Jump into Main loop Setup SoC and Board Specific Devices board_init() cpu/n1213/ag101/low_levelinit.S cpu/n1213/ag101/watchdog.S Turnoff Watchdog Setup Memory Memory REMAP Setup Memory Controller or on-chip SRAM

Binary relocation and memory remap. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Binary relocation and memory remap. ,[object Object],FLASH/ROM U-boot DRAM ... 0x00000000 0x10000000 FLASH/ROM DRAM ... U-boot U-boot copy Relocation for REMAP REMAP … DRAM FLASH/ROM ... U-boot U-boot General Relocation U-boot runs in DRAM with adjusted linking address. DRAM FLASH/ROM ... U-boot U-boot U-boot relo U-boot runs in DRAM with the origin linking address.

Binary relocation and memory remap. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Memory relocation and remap. ,[object Object],FLASH/ROM U-boot DRAM ... 0x00000000 0x10000000 FLASH/ROM DRAM ... U-boot U-boot $PC FLASH/ROM DRAM ... U-boot U-boot copy DRAM FLASH/ROM ... U-boot U-boot $PC+4 The Instruction affects REMAP REMAP, Change the Base Address U-boot runs in DRAM with the origin linking address. Relocation for REMAP remap

Binary relocation and memory remap. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Binary relocation and memory remap. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Binary relocation and memory remap. ,[object Object],0x00000000 0x10000000 Pre-loader will copy u-boot to DRAM. lowlevel_init without remap copy lowlevel_init with remap Without lowlevel_init U-boot will copy itself to DRAM. FLASH/ROM U-boot DRAM ... FLASH/ROM DRAM ... U-boot U-boot relo DRAM FLASH/ROM ... U-boot U-boot relo U-boot copy DRAM FLASH/ROM ... U-boot U-boot relo U-boot pre-loader

Vector setup. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Vector setup. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Low Level Initialization Turnoff Watchdog Setup Memory Memory REMAP Setup Memory Controller or on-chip SRAM

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Low level initialization ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Stack setup and jump into C functions. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Setup SP for Early Board Setup Environment (ASM->C)

Stack setup and jump into C functions. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],Early Board Setup board_init_f() Early Devices Setup Calculate Addresses (SP, Dest, GD) for Relocation Setup SP for Common Board Setup

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Early board and peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Relocation. ,[object Object],[object Object],[object Object],Relocation Copy Binary to RAM Fix Relocation Fix GOT Clear BSS

General Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

General Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],.TEXT .rodata .got .data .u_boot_cmd .bss 0x00000000 .TEXT .rodata .got .data .u_boot_cmd .bss 0x10000000 0x00000000 0x00000000 0x00021cb8 0x00000000 0x00008a74 0x001023a4 .got in FLASH 0x00000000 0x00000000 0x10021cb8 0x10000000 0x10008a74 0x101023a4 .got in RAM

General Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Relocation. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],Common Board Setup board_init_r() Setup mem for dlmalloc() Setup Board Data Setup Board FLASH Load Default Environments Setup Environment env_relocate(); Jump into Main loop Setup SoC and Board Specific Devices board_init()

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Common board and other peripherals initialization. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Appendix: An Example of Vector Implements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Appendix: reset_cpu ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bootstrap process of u boot (NDS32 RISC CPU)

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Bootstrap process of u boot (NDS32 RISC CPU)