mirror of
https://github.com/AsahiLinux/m1n1
synced 2024-09-20 13:11:53 +00:00
3b68165900
-t is optional, we may not have a tty_dev, so we can avoid trying to grab the baudrate from it if it's unspecified. We don't want to use dtb_addr for booti; this is the unmodified payload. m1n1 will load it and add bits to it at a separate address for passing on to U-Boot. For booti purposes, we actually want the augmented FDT rather than the user-specified. Signed-off-by: Kyle Evans <kevans@FreeBSD.org>
153 lines
4.9 KiB
Python
Executable file
153 lines
4.9 KiB
Python
Executable file
#!/usr/bin/env python3
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# SPDX-License-Identifier: MIT
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import sys, pathlib
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import serial
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sys.path.append(str(pathlib.Path(__file__).resolve().parents[1]))
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import argparse, pathlib
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parser = argparse.ArgumentParser(description='(Linux) kernel loader for m1n1')
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parser.add_argument('payload', type=pathlib.Path)
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parser.add_argument('dtb', type=pathlib.Path)
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parser.add_argument('initramfs', nargs='?', type=pathlib.Path)
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parser.add_argument('--compression', choices=['auto', 'none', 'gz', 'xz'], default='auto')
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parser.add_argument('-b', '--bootargs', type=str, metavar='"boot arguments"')
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parser.add_argument('-t', '--tty', type=str)
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parser.add_argument('-u', '--u-boot', type=pathlib.Path, help="load u-boot before linux")
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args = parser.parse_args()
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from m1n1.setup import *
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if args.compression == 'auto':
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suffix = args.payload.suffix
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if suffix == '.gz':
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args.compression = 'gz'
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elif suffix == '.xz':
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args.compression = 'xz'
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else:
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raise ValueError('unknown compression for {}'.format(args.payload))
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if args.tty is not None:
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tty_dev = serial.Serial(args.tty)
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tty_dev.reset_input_buffer()
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tty_dev.baudrate = 1500000
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else:
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tty_dev = None
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payload = args.payload.read_bytes()
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dtb = args.dtb.read_bytes()
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if args.initramfs is not None:
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initramfs = args.initramfs.read_bytes()
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initramfs_size = len(initramfs)
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else:
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initramfs = None
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initramfs_size = 0
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if args.bootargs is not None:
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print('Setting boot args: "{}"'.format(args.bootargs))
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p.kboot_set_chosen("bootargs", args.bootargs)
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if args.compression != 'none':
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compressed_size = len(payload)
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compressed_addr = u.malloc(compressed_size)
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print("Loading %d bytes to 0x%x..0x%x..." % (compressed_size, compressed_addr, compressed_addr + compressed_size))
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iface.writemem(compressed_addr, payload, True)
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dtb_addr = u.malloc(len(dtb))
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print("Loading DTB to 0x%x..." % dtb_addr)
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iface.writemem(dtb_addr, dtb)
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kernel_size = 512 * 1024 * 1024
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kernel_base = u.memalign(2 * 1024 * 1024, kernel_size)
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boot_addr = kernel_base
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print("Kernel_base: 0x%x" % kernel_base)
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assert not (kernel_base & 0xffff)
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if initramfs is not None:
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initramfs_base = u.memalign(65536, initramfs_size)
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print("Loading %d initramfs bytes to 0x%x..." % (initramfs_size, initramfs_base))
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iface.writemem(initramfs_base, initramfs, True)
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p.kboot_set_initrd(initramfs_base, initramfs_size)
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if args.u_boot:
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uboot = bytearray(args.u_boot.read_bytes())
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uboot_size = len(uboot)
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uboot_addr = u.memalign(2*1024*1024, len(uboot))
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print("Loading u-boot to 0x%x..." % uboot_addr)
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bootenv_start = uboot.find(b"bootcmd=run distro_bootcmd")
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bootenv_len = uboot[bootenv_start:].find(b"\x00\x00")
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bootenv_old = uboot[bootenv_start:bootenv_start+bootenv_len]
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bootenv = str(bootenv_old, "ascii").split("\x00")
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bootenv = list(filter(lambda x: not (x.startswith("baudrate") or x.startswith("boot_") or x.startswith("distro_bootcmd")), bootenv))
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if initramfs is not None:
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bootcmd = "distro_bootcmd=booti 0x%x 0x%x:0x%x $fdtcontroladdr" % (kernel_base, initramfs_base, initramfs_size)
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else:
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bootcmd = "distro_bootcmd=booti 0x%x - $fdtcontroladdr" % (kernel_base)
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if tty_dev is not None:
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bootenv.append("baudrate=%d" % tty_dev.baudrate)
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bootenv.append(bootcmd)
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if args.bootargs is not None:
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bootenv.append("bootargs=" + args.bootargs)
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bootenv_new = b"\x00".join(map(lambda x: bytes(x, "ascii"), bootenv))
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bootenv_new = bootenv_new.ljust(len(bootenv_old), b"\x00")
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if len(bootenv_new) > len(bootenv_old):
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raise Exception("New bootenv cannot be larger than original bootenv")
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uboot[bootenv_start:bootenv_start+bootenv_len] = bootenv_new
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u.compressed_writemem(uboot_addr, uboot, True)
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p.dc_cvau(uboot_addr, uboot_size)
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p.ic_ivau(uboot_addr, uboot_size)
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boot_addr = uboot_addr
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p.smp_start_secondaries()
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if p.kboot_prepare_dt(dtb_addr):
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print("DT prepare failed")
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sys.exit(1)
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iface.dev.timeout = 40
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if args.compression == 'none':
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kernel_size = len(payload)
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print("Loading %d bytes to 0x%x..0x%x..." % (kernel_size, kernel_base, kernel_base + kernel_size))
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iface.writemem(kernel_base, payload, True)
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elif args.compression == 'gz':
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print("Uncompressing gz ...")
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kernel_size = p.gzdec(compressed_addr, compressed_size, kernel_base, kernel_size)
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elif args.compression == 'xz':
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print("Uncompressing xz ...")
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kernel_size = p.xzdec(compressed_addr, compressed_size, kernel_base, kernel_size)
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else:
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raise ValueError('unsupported compression {}'.format(args.compression))
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print(kernel_size)
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if kernel_size < 0:
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raise Exception("Decompression error!")
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print("Decompress OK...")
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p.dc_cvau(kernel_base, kernel_size)
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p.ic_ivau(kernel_base, kernel_size)
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print("Ready to boot")
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daif = u.mrs(DAIF)
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daif = 0xc0
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u.msr(DAIF, daif)
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print("DAIF: %x" % daif)
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p.kboot_boot(boot_addr)
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iface.ttymode(tty_dev)
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