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BeagleBoard-xM Bootloaders
1.
© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. BeagleBoard-xM Bootloaders
2.
2© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. What to Expect? Beagle Booting Process W's of X-Loader BSP in X-Loader W's of U-Boot BSP in U-Boot
3.
3© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. General Booting of BeagleBoard ROM Code Internal ROM X-Loader Internal SRAM Internal ROM U-Boot External DDR Kernel External DDR
4.
4© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. X-Loader
5.
5© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. W's of X-Loader First stage bootloader for Beagle Board Derived from u-boot – the second stage bootloader Named as MLO (Memory Loader) in filesystem. Runs in an internal SRAM Loads the second stage bootloader i.e. U-Boot
6.
6© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. Let's Get Down to Source Code
7.
7© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. BSP for X-Loader cpu/omap3 board/omap3530beagle/omap3530beagle.c board/omap3530beagle/platform.S lib/board.c include/configs/omap3530beagle.h
8.
8© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. U-Boot
9.
9© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. W's of U-Boot Universal Bootloader (U-Boot) An Open Source Bootloader With minimal changes, can be ported for any board GRUB/LILO Designed with x-86 in mind Huge in Size Needs to be changed drastically for porting on other architecture
10.
10© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. U-Boot Source Tree arch – Architecture dependent Code board – Board dependent Code common – Environment & Command Line Code doc – Documentation drivers – Device specific Drivers fs – File System support Code include – Headers lib – Compression, Encryption related Code net – Minimal Network Stack tools – U-Boot Utilities (mkimage is here)
11.
11© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. U-Boot Initialization Details Bootloader starts its execution from flash /RAM Hardware Diagnostics, like POST, … Configuring the CPU speed, MMU setting, etc Memory setup & initialization Setting up interfacing ports like serial, VGA, … Sets up the address of the boot parameters
12.
12© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. U-Boot Configuration Creating a configuration file for the board Adding an entry in the board.cfg Architecture CPU Board Vendor (May be NULL) SoC (May be NULL)
13.
13© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. Let's Get Down to Source Code
14.
14© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. Which folders to look for? include/asm/mach-types.h - machine id arch/arm/include/asm/arch-omap3 cpu/armv7/omap3/board.c ti/beagle/beagle.c arch/arm/lib/board.c – specific to arm
15.
15© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. U-Boot Porting Implies adding a new Board to U-Boot That entails Adding board specific code at the right places Adding the new board directory under board/ with Makefile Initialization Code for the Board Configuration Makefile Adding the new board header under include/configs/ with Configuration for the Board
16.
16© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. What all have learnt? Beagle Booting Process W's of X-Loader BSP in X-Loader W's of U-Boot BSP in U-Boot
17.
17© 2014-17 SysPlay
Workshops <workshop@sysplay.in> All Rights Reserved. Any Queries?