Re: [Qemu-devel] MIPS little endian - Bug when decoding physaddr

[Vinicius Maciel]

2017-06-23 17:21 GMT-03:00 Philippe Mathieu-Daudé <address@hidden>:

> Hi Vinicius,
>
> Looking at the RT5350 datasheet:
> http://www.mouser.com/ds/2/813/RT5350-1022839.pdf
>
> pp.19>
> 3.2 Memory Map Summary
> 1000.0000 - 1000.00FF 256 Mbps    SYSCTL
> 1011.0000 - 1011.7FFF  32 Kbps    Ethernet switch
>
> pp.22>
> 3.4 System Control
> 3.4.3 Register Description (base: 0x1000_0000)
> GPIOMODE: GPIO Purpose Select (offset: 0x0060)
>
> pp.122>
> 3.19 Ethernet Switch
> 3.19.4 Register Description (base: 0x1011_0000)
> LEDC: LED Control Register  (offset: 0x0168)
> LED Polarity Control for each port: 1’b1: High active
>
> having 23=0b10111 my guess is your reset() function try to toggle on 4
> leds. everything seems fine on QEMU side, now it depends how you
> implemented the SYSCTL and EthernetSwitch devices.
>
> eventually you are missing some EthernetSwitch mapped registers and an
> exception is generated, ending reading some SYSCTL register...
>
> running qemu-system with '-d in_asm,int,unimp' helps to understand if them
> problem comes from your model, before from QEMU core code.
>
> regards,
>
> Phil.
>

Hi,

In the machine code, I added Ethernet Switch at 0x10110000:
ralink_router.c#L282
<https://gitlab.com/vinifr/qemu-routers/blob/ralink/hw/mips/ralink_router.c#L282>.
And here is Ethernet code: ralink_net.c
<https://gitlab.com/vinifr/qemu-routers/blob/ralink/hw/net/ralink_net.c>.
I'm trying to run u-boot bootloader: u-boot_RT5350F-OLinuXino
<https://github.com/OLIMEX/u-boot_RT5350F-OLinuXino>. The problem happens
when executing this line: start.S#L1540
<https://github.com/OLIMEX/u-boot_RT5350F-OLinuXino/blob/master/cpu/ralink_soc/start.S#L1540>
.

I have found Qemu reaches the function memory_region_dispatch_write:

memory_region_dispatch_write (mr=0x555556219880 <io_mem_unassigned>,
addr=269549928, data=23,
    size=4, attrs=...) at
/home/vini/projs/emuladores/qemu-routers/memory.c:1306
1306    if (!memory_region_access_valid(mr, addr, size, true)) {
(gdb) n
1307        unassigned_mem_write(mr, addr, data, size);
                return MEMTX_DECODE_ERROR;
    }

So, it happened a decode error even with Ethernet Switch registered at
0x10110000.

Thanks for help!
Vini