rpi5_native_start masks x0 down to the documented 32-bit DTB-pointer range
(the firmware's own entry protocol leaves the upper 32 bits unspecified),
stores it into g_rpi5_dtb_ptr for the still-open DTB->BootInfo constructor
(item 2) to read, then switches sp to a dedicated 2 MiB BSS stack -- this
path has no EDK2 boot stack to inherit, unlike every other entry path in
this codebase.
Intentionally halts (wfe/b loop) afterward rather than tail-calling into
item 2's constructor, which doesn't exist yet -- no stub function pretending
to be more than it is.
Not yet linked at the real 0x80000 load address; that needs its own linker
script/build target, not scoped into this item. Compiles and links into the
existing ARCH=aarch64 QEMU/UEFI acceptance build as dead code (ELF kernel
build's KERNEL_ASM wildcards every *.S in arch/aarch64/; nothing there
branches to it), same as rpi5_dtb.c/rpi5_mailbox.c before it.
Verified 3-arch boot to ok>/zuse)ok>.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YcT3H2PQeyujrzjqS3Var
