[Verse 1] Started with a reference board, vanilla ARM design Generic drivers worked just fine, everything aligned But now we've got custom silicon, peripherals brand new Need to teach the kernel how to speak hardware's language too [Chorus] Port the arch, adapt the code HAL abstracts the hardware mode BSP bridges what we need Device trees plant the seed Memory maps and interrupt lines Register layouts, timing signs Architecture porting, piece by piece Making custom silicon speak [Verse 2] Boot sequence starts in assembly, low level and bare Setting up the memory controller, cache coherency care Vector tables point to handlers, exceptions find their way While the MMU translates addresses, virtual to physical display [Chorus] Port the arch, adapt the code HAL abstracts the hardware mode BSP bridges what we need Device trees plant the seed Memory maps and interrupt lines Register layouts, timing signs Architecture porting, piece by piece Making custom silicon speak [Bridge] Platform drivers know the details GPIO banks and clock domains SPI controllers, I2C trails Power management remains Board files tell the story Of how components connect Architecture glory When abstraction intersects [Verse 3] Kernel config options toggle features on and off Makefile dependencies, linking without scoff Cross compiler targets architecture, toolchain understands While debugging through JTAG reveals where trouble lands [Final Chorus] Port the arch, adapt the code HAL abstracts the hardware mode BSP bridges what we need Device trees plant the seed Memory maps and interrupt lines Register layouts, timing signs Architecture porting, piece by piece Making custom silicon speak Custom silicon finally speak
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