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103 lines
3.1 KiB
Python
Executable File
103 lines
3.1 KiB
Python
Executable File
#!/usr/bin/env python3
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import mmap
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import argparse
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import sys
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FW_START = 0x00004000
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FW_BASE = 0x00040000 + FW_START
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FW_LIMIT = 0x00054000
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FW_SIZE = FW_LIMIT - FW_BASE
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EXCEPTIONS_BASE = 0x00040000
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EXCEPTIONS_LIMIT = 0x00042000
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EXCEPTIONS_SIZE = EXCEPTIONS_LIMIT - EXCEPTIONS_BASE
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EXCEPTIONS_JUMP = FW_START # All exceptions reset program
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NR_OF_EXCEPTIONS = 14
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R_CPU_CFG_PAGE_BASE = 0x01F01000
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R_CPU_CFG_PAGE_LIMIT = 0x01F02000
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R_CPU_CFG_SIZE = R_CPU_CFG_PAGE_LIMIT - R_CPU_CFG_PAGE_BASE
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R_CPU_CFG_OFFSET = 0xC00
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R_CPU_CLK_OFFSET = 0x400
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parser = argparse.ArgumentParser(description='Flash and reset SRAM A2 of A64')
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parser.add_argument('filename', nargs='?', help='binary file to write')
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parser.add_argument('--reset', action='store_true', help='reset the AR100')
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parser.add_argument('--halt', action='store_true', help='Halt the AR100')
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parser.add_argument('--bl31', action='store_true', help='write bl31')
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args = parser.parse_args()
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def write_exception_vectors():
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print("Writing exception vectors")
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with open("/dev/mem", "w+b") as f:
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exc = mmap.mmap(f.fileno(),
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length=EXCEPTIONS_SIZE,
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offset=EXCEPTIONS_BASE)
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for i in range(NR_OF_EXCEPTIONS):
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add = i * 0x100
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exc[add:add + 4] = ((EXCEPTIONS_JUMP - add) >> 2).to_bytes(
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4, byteorder='little')
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exc.close()
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def assert_deassert_reset(ass):
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with open("/dev/mem", "w+b") as f:
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r_cpucfg = mmap.mmap(f.fileno(),
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length=R_CPU_CFG_SIZE,
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offset=R_CPU_CFG_PAGE_BASE)
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if ass:
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r_cpucfg[R_CPU_CFG_OFFSET] &= ~0x01
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if r_cpucfg[R_CPU_CFG_OFFSET] & 0x01:
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print("failed to assert reset")
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else:
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r_cpucfg[R_CPU_CFG_OFFSET] |= 0x01
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if not (r_cpucfg[R_CPU_CFG_OFFSET] & 0x01):
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print("failed to deassert reset")
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r_cpucfg.close()
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def write_file(filename):
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with open(filename, "r+b") as fw:
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data = fw.read()
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if len(data) > FW_SIZE:
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print("File does not fit in memory")
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sys.exit(1)
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print("Writing file to SRAM A2")
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with open("/dev/mem", "w+b") as f:
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sram_a2 = mmap.mmap(f.fileno(), length=FW_SIZE, offset=FW_BASE)
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sram_a2[0:len(data)] = data
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sram_a2.close()
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def clear_magic_word():
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with open("/dev/mem", "w+b") as f:
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sram_a2 = mmap.mmap(f.fileno(), length=FW_SIZE, offset=FW_BASE)
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sram_a2[0] = 0x0
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sram_a2.close()
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if args.reset:
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print("Resetting AR100")
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assert_deassert_reset(1)
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assert_deassert_reset(0)
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sys.exit(0)
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if args.filename:
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if args.bl31:
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print("writing bl31")
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assert_deassert_reset(1)
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write_file(args.filename)
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else:
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assert_deassert_reset(1)
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write_exception_vectors()
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write_file(args.filename)
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assert_deassert_reset(0)
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if args.halt:
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print("Halting AR100")
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assert_deassert_reset(1)
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clear_magic_word()
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