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json2dts_linux: Add configuration for root device

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This allows setting a root device other than ram0, this is useful
when using a rootfs from the SD card.  Doing this makes boot time
faster and saves on memory footprint used by an in ram initrd.
This commit is contained in:
Stafford Horne 2021-09-12 09:31:52 +09:00
parent ec2f2a6af5
commit ea06948c62
1 changed files with 7 additions and 2 deletions
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9
litex/tools/litex_json2dts_linux.py
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@ -12,7 +12,7 @@ import json
import argparse
import os
def generate_dts(d, initrd_start=None, initrd_size=None, initrd=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
@ -52,13 +52,16 @@ def generate_dts(d, initrd_start=None, initrd_size=None, initrd=None, polling=Fa
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} {console} {rootfs} init=/sbin/init swiotlb=32";""".format(
main_ram_base = d["memories"]["main_ram"]["base"],
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/ram0")
rootfs = "rootwait root=/dev/{}".format(root_device))
if initrd_enabled is True:
dts += """
@ -644,6 +647,7 @@ def main():
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()
@ -652,6 +656,7 @@ def main():
initrd_start = args.initrd_start,
initrd_size = args.initrd_size,
initrd = args.initrd,
root_device = args.root_device,
polling = args.polling,
)
print(r)