Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) BMIPS DeviceTree Booting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) ------------------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)   Some bootloaders only support a single entry point, at the start of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)   kernel image.  Other bootloaders will jump to the ELF start address.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)   Both schemes are supported; CONFIG_BOOT_RAW=y and CONFIG_NO_EXCEPT_FILL=y,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)   so the first instruction immediately jumps to kernel_entry().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)   Similar to the arch/arm case (b), a DT-aware bootloader is expected to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)   set up the following registers:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)          a0 : 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)          a1 : 0xffffffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)          a2 : Physical pointer to the device tree block (defined in chapter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)          II) in RAM.  The device tree can be located anywhere in the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)          512MB of the physical address space (0x00000000 - 0x1fffffff),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)          aligned on a 64 bit boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)   Legacy bootloaders do not use this convention, and they do not pass in a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   DT block.  In this case, Linux will look for a builtin DTB, selected via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)   CONFIG_DT_*.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)   This convention is defined for 32-bit systems only, as there are not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)   currently any 64-bit BMIPS implementations.