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dts: Allow specifying initrd position and size via args

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This is needed as my initrd size is much larger than the default 8mb.
Also, sometimes the kernel I build is also large, so its good to be
able to move the initrd starting position.

Issue #748
This commit is contained in:
Stafford Horne 2020-12-28 22:04:18 +09:00
parent bddb170650
commit a2c9b17959
1 changed files with 13 additions and 9 deletions
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22
litex/tools/litex_json2dts.py
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@ -12,7 +12,7 @@ import json
import argparse
def generate_dts(d):
def generate_dts(d, initrd_start_offset=None, initrd_size=None):
kB = 1024
mB = kB*1024
@ -32,14 +32,16 @@ def generate_dts(d):
"""
# Boot Arguments -------------------------------------------------------------------------------
linux_initrd_start_offset = {
default_initrd_start_offset = {
"mor1kx": 8*mB,
"vexriscv smp-linux" : 16*mB,
}
linux_initrd_end_offset = {
"mor1kx": 16*mB,
"vexriscv smp-linux" : 24*mB,
}
if initrd_start_offset is None:
initrd_start_offset = default_initrd_start_offset[cpu_name]
if initrd_size is None:
initrd_size = 8*mB
dts += """
chosen {{
@ -51,8 +53,8 @@ def generate_dts(d):
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"] + linux_initrd_start_offset[cpu_name],
linux_initrd_end = d["memories"]["main_ram"]["base"] + linux_initrd_end_offset[cpu_name])
linux_initrd_start = d["memories"]["main_ram"]["base"] + initrd_start_offset,
linux_initrd_end = d["memories"]["main_ram"]["base"] + initrd_start_offset + initrd_size)
# CPU ------------------------------------------------------------------------------------------
@ -542,11 +544,13 @@ def generate_dts(d):
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="The location the kernel will look for initrd, used to define linux,initrd-start (default depends on CPU)")
parser.add_argument("--initrd-size", type=int, help="The size of the initrd, used to calculate linux,initrd-end (default=8MB)")
args = parser.parse_args()
d = json.load(open(args.csr_json))
print(generate_dts(d))
print(generate_dts(d, getattr(args, "initrd_start"), getattr(args, "initrd_size")))
if __name__ == "__main__":