Hi all, I have been trying to develop a model for Pl081 DMA controller.
I have inherited class from AmbaDmaDevice and as a first step I have given register read/write features. And added it in M5 system by editing RealView.py to membus. I have couple of questions, 1- It should be on membus right ? rather then on IO bus !! 2- How can I reduce the bus width from 64 to 32 ? 3- After configuration I am getting this : *from config.ini* *.* *.* *.* *[system.membus]* *type=Bus* *children=badaddr_responder* *block_size=64* *bus_id=1* *clock=1000* *header_cycles=1* *use_default_range=false* *width=64* *default=system.membus.badaddr_responder.pio* *port=system.bridge.side_b system.physmem.port[0] system.physmem2.port[0] system.diskmem.port[0] system.realview.gic.pio system.realview.l2x0_fake.pio system.realview.dmac.pio system.cpu.itb.walker.port system.cpu.dtb.walker.port system.cpu.icache_port system.cpu.dcache_port system.realview.dmac.dma* * * *[system.membus.badaddr_responder]* *type=IsaFake* *pio_addr=0* *pio_latency=1000* *pio_size=8* *platform=system.realview* *ret_bad_addr=true* *ret_data16=65535* *ret_data32=4294967295* *ret_data64=18446744073709551615* *ret_data8=255* *system=system* *update_data=false* *warn_access=warn* *pio=system.membus.default* * * *[system.realview.dmac]* *type=Pl081* *amba_id=1314945* *gic=system.realview.gic* *int_num=55* *max_backoff_delay=10000000* *min_backoff_delay=4000* *pio_addr=268632064* *pio_latency=10000* *platform=system.realview* *system=system* *dma=system.membus.port[11]* *pio=system.membus.port[6]* but when I run Linux kernel with NO DMA / PL081 drivers.(I have written my own driver to read write dma registers for time being).I am getting this,(here 0x10030fe0 is AMBA ID1 read only register) *from the M5-log:* *.* *.* *.* *warn: Device system.membus.badaddr_responder accessed by read to address 0x10030fe0 size=4* *For more information see: http://www.m5sim.org/warn/f6456e4f* *m5.debug: build/ARM_FS/cpu/simple/atomic.cc:347: Fault AtomicSimpleCPU::readBytes(Addr, uint8_t*, unsigned int, unsigned int): Assertion `!pkt.isError()' failed.* *Program aborted at cycle 4790235000* *Aborted*
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