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json2dts_linux: Allow disabling of initrd

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This commit is contained in:
Stafford Horne 2021-09-12 07:35:32 +09:00
parent e0e9311ceb
commit 378d129c5f
1 changed files with 27 additions and 10 deletions
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37
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, polling=False):
kB = 1024
mB = kB*1024
@ -44,18 +44,32 @@ 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)
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,
linux_initrd_start = d["memories"]["main_ram"]["base"] + initrd_start,
linux_initrd_end = d["memories"]["main_ram"]["base"] + initrd_start + initrd_size)
console = "console=liteuart earlycon=sbi",
rootfs = "rootwait root=/dev/ram0")
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 ------------------------------------------------------------------------------------------
@ -624,10 +638,12 @@ 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("--polling", action="store_true", help="Force polling mode on peripherals")
args = parser.parse_args()
@ -635,6 +651,7 @@ def main():
r = generate_dts(d,
initrd_start = args.initrd_start,
initrd_size = args.initrd_size,
initrd = args.initrd,
polling = args.polling,
)
print(r)