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Diffstat (limited to 'README')
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@@ -0,0 +1,51 @@ + +The bootloader environment consists of a set of libraries that provide +various features and a couple small driver programs that build against +these libraries. The libraries used come from three categories -- +generic (containing code useful to any bootloader), architecture +(containing code useful to a specific cpu, system-on-chip, etc), and +board (containing code useful to a single specific device) + +For the purpose of this discussion, we will involve the fictional +companies Outstanding Electronics Manufacturing (OEM) and Silicon +Engineering Management, Inc (SEMI). OEM produces the quality Brick +mobile device using SEMI's 65002 ARM-based system-on-chip. + +Common bootloader libraries and base architectures: + +boot/include/boot headers +boot/libboot libboot.a +boot/libc libboot_c.a +boot/arch_armv6 libboot_arch_armv6.a + +Architecture-specific libraries for SEMI 65002 SOC: + +partner/semi/boot/include/65002 headers +partner/semi/boot/arch_65002 liboot_arch_65002.a + +Device-specific library for OEM Brick phone: + +partner/oem/brick/product_config.mk configuration +partner/oem/brick/boot libboot_board_brick.a + +The actual bootloader: + +boot/bootloader bootloader + + +The product_config.mk defines three important build variables: + +DEVICE_BOOTLOADER_LIBS := \ + libboot_board_brick.a \ + libboot_arch_65002.a \ + libboot_arch_armv6.a + +DEVICE_BOOTLOADER_LINK_SCRIPT := \ + partner/semi/boot/boot.ld + +DEVICE_BOOTLOADER_INIT := \ + partner/semi/boot/init.S + +Which are used by the bootloader to specify which board and +architecture specific libraries to link against as well as what link +script and init.S to use |