mirror of
https://github.com/AsahiLinux/m1n1
synced 2024-11-22 14:43:08 +00:00
e98f3a3525
The FreeBSD script added in #185 required patching u-boot since it specified the loader base/size in a non-standard way. This changes the way arguments are passed to the bootefi command so it works with the asahi u-boot fork which I've been using. I also changed the case where the loader isn't specified to have u-boot boot from the nvme since I have that driver functional enough to have it mount the root fs now. Signed-off-by: Ayrton Munoz <a.munoz3327@gmail.com>
136 lines
4.2 KiB
Python
Executable file
136 lines
4.2 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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# FreeBSD's setup differs from Linux's in the following primary ways:
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#
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# 1.) We pretend our kernel is an initramfs and pick it up as such in a modified
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# loader build. This is the simplest way to avoid having ad-hoc
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# interpretations of stuff in m1n1 for our quirky development setup.
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#
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# 2.) U-Boot and dtb are required, loader/kernel are not. The latter are
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# assumed to be discoverable by the standard U-Boot process on disk if they
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# are not specified. Otherwise, we'll load them from memory if they are
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# provided.
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#
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parser = argparse.ArgumentParser(description='(FreeBSD) kernel loader for m1n1')
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parser.add_argument('u_boot', type=pathlib.Path, help="load u-boot before linux")
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parser.add_argument('dtb', type=pathlib.Path)
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parser.add_argument('-l', '--loader', type=pathlib.Path)
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parser.add_argument('-k', '--kernel', type=pathlib.Path)
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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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args = parser.parse_args()
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from m1n1.setup import *
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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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if args.loader is not None:
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loader = args.loader.read_bytes()
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loader_size = len(loader)
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else:
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loader = None
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loader_size = 0
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dtb = args.dtb.read_bytes()
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if args.kernel is not None:
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kernel = args.kernel.read_bytes()
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kernel_size = len(kernel)
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else:
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kernel = None
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kernel_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("bootarg", args.bootargs)
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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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loader_base = u.memalign(2 * 1024 * 1024, loader_size)
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print("loader_base: 0x%x" % loader_base)
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assert not (loader_base & 0xffff)
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if kernel is not None:
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kernel_base = u.memalign(65536, kernel_size)
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print("Loading %d kernel bytes to 0x%x..." % (kernel_size, kernel_base))
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iface.writemem(kernel_base, kernel, True)
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p.kboot_set_initrd(kernel_base, kernel_size)
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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_") and not x.startswith("boot_efi_")) or x.startswith("distro_bootcmd")), bootenv))
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if loader is not None:
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# dtb_addr not used here, the prepared fdt's at a different location. If
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# we use this one, we won't get any of our /chosen additions, for instance.
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bootcmd = "distro_bootcmd=bootefi 0x%x:0x%x" % (loader_base, loader_size)
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else:
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bootcmd = "distro_bootcmd=devnum=0; run nvme_boot"
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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 loader is not None:
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print("Loading %d bytes to 0x%x..0x%x..." % (loader_size, loader_base, loader_base + loader_size))
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iface.writemem(loader_base, loader, True)
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p.dc_cvau(loader_base, loader_size)
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p.ic_ivau(loader_base, loader_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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