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Merge pull request #1032 from stffrdhrn/json2dts-sdcard

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Json2dts sdcard booting
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enjoy-digital 2021-09-21 13:13:07 +02:00 committed by GitHub
commit b1b1e92ad0
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1 changed files with 32 additions and 10 deletions
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38
litex/tools/litex_json2dts_linux.py
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@ -10,9 +10,9 @@
import sys
import json
import argparse
import os
def generate_dts(d, initrd_start=None, initrd_size=None, polling=False):
def generate_dts(d, initrd_start=None, initrd_size=None, initrd=None, root_device=None, polling=False):
kB = 1024
mB = kB*1024
@ -44,19 +44,36 @@ def generate_dts(d, initrd_start=None, initrd_size=None, polling=False):
if initrd_size is None:
initrd_size = default_initrd_size
if initrd == "enabled" or initrd is None:
initrd_enabled = True
elif initrd == "disabled":
initrd_enabled = False
else:
initrd_enabled = True
initrd_size = os.path.getsize(initrd)
if root_device is None:
root_device = "ram0"
dts += """
chosen {{
bootargs = "mem={main_ram_size_mb}M@0x{main_ram_base:x} rootwait console=liteuart earlycon=sbi root=/dev/ram0 init=/sbin/init swiotlb=32";
linux,initrd-start = <0x{linux_initrd_start:x}>;
linux,initrd-end = <0x{linux_initrd_end:x}>;
}};
""".format(
bootargs = "mem={main_ram_size_mb}M@0x{main_ram_base:x} {console} {rootfs} init=/sbin/init swiotlb=32";""".format(
main_ram_base = d["memories"]["main_ram"]["base"],
main_ram_size = d["memories"]["main_ram"]["size"],
main_ram_size_mb = d["memories"]["main_ram"]["size"] // mB,
console = "console=liteuart earlycon=liteuart,0x{:x}".format(d["csr_bases"]["uart"]),
rootfs = "rootwait root=/dev/{}".format(root_device))
if initrd_enabled is True:
dts += """
linux,initrd-start = <0x{linux_initrd_start:x}>;
linux,initrd-end = <0x{linux_initrd_end:x}>;""".format(
linux_initrd_start = d["memories"]["main_ram"]["base"] + initrd_start,
linux_initrd_end = d["memories"]["main_ram"]["base"] + initrd_start + initrd_size)
dts += """
};
"""
# CPU ------------------------------------------------------------------------------------------
# VexRiscv-SMP
@ -624,10 +641,13 @@ def generate_dts(d, initrd_start=None, initrd_size=None, polling=False):
return dts
def main():
parser = argparse.ArgumentParser(description="LiteX's CSR JSON to Linux DTS generator")
parser.add_argument("csr_json", help="CSR JSON file")
parser.add_argument("--initrd-start", type=int, help="Location of initrd in RAM (relative, default depends on CPU)")
parser.add_argument("--initrd-size", type=int, help="Size of initrd (default=8MB)")
parser.add_argument("--initrd", type=str, help="Supports arguments 'enabled', 'disabled' or a file name. Set to 'disabled' if you use a kernel built in rootfs or have your rootfs on an SD card partition. If a file name is provied the size of the file will be used instead of --initrd-size. (default=enabled)")
parser.add_argument("--root-device", type=str, help="Device that has our rootfs, if using initrd use the default. For SD card's use something like mmcblk0p3. (default=ram0)")
parser.add_argument("--polling", action="store_true", help="Force polling mode on peripherals")
args = parser.parse_args()
@ -635,6 +655,8 @@ def main():
r = generate_dts(d,
initrd_start = args.initrd_start,
initrd_size = args.initrd_size,
initrd = args.initrd,
root_device = args.root_device,
polling = args.polling,
)
print(r)