[ARM11] Question for the ARM 11 GPIO MAPPING

[Adam Lackorzynski]

Hi,

On Tue Feb 26, 2013 at 20:10:15 +0800, Jason.han wrote:
>                 Now I  have  GPIO Mapping  problems happened when
> run the L4re in Arm 11 (6410 ).
> 
>                .devs ==> Res.mmio(0x7f008100, 0x7f00813f);
>                .lcd.c ==>l4io_request_iomem(0x7f008100, 0x03f,
> L4IO_MEM_NONCACHED, &lcd_gpio_virt_base);
> 
>                 when
> "l4_mem_write(lcd_gpio_virt_base+0x00,L4_MEM_WIDTH_4BYTE,0xaaaaaaaa);
>                 download in real-hw board : the core will died as it :
> 
> Ned: loading file: 'rom/arm-rv-lcd.cfg'
> 
>        hello   | Hello World!
>        IO      | Dev_factory: register factory for N2Hw6DeviceE
>        IO      | GTF: register factory for 7Pci_dev
>        IO      | GTF: register factory for N2Hw12Msi_resourceE
>        IO      | Dev_factory: register factory for N2Hw11Gpio_deviceE
>        IO      | Io service
>        IO      | Ready. Waiting for request.
>        fbdrv   | Using LCD driver: S3C6410
>        fbdrv   | lcd_control_virt_base is 0x3000
>        fbdrv   | lcd_gpio_virt_base is 0x4000
>        fbdrv   | Video memory is at virtual 0x5000 (size: 0x3fc00 Bytes)
>        fbdrv   | Physical video memory is at 0x50394000   ==>core died
> 
>                 after delete it and only use l4_mem_read , value always is
> 
>                  IO       | Ready. Waiting for request.
> 
>        fbdrv   | Using LCD driver: S3C6410
>        fbdrv   | lcd_control_virt_base is 0x3000
>        fbdrv   | lcd_gpio_virt_base is 0x4000
>        fbdrv   | Video memory is at virtual 0x5000 (size: 0x3fc00 Bytes)
>        fbdrv   | Physical video memory is at 0x50395000
>        fbdrv   | 0 value is 0x220022   ==> core run is ok.
> 
>        In the range of the GPIO  ,whatever I defined , the
>        lcd_gpio_virt_base + offset (value 0) is always 0x220022 ,can't
>        be written  .
>        the lcd_gpio_virt_base + offset (value 0x04) is always 0x23 ,can
>        be written ,but value never be changed .
>         From Offset (value 0x08) is normal . why only GPIO like this ,I
>        write some time and control -register always OK.
> 
>        Do you know Why , Can you give me some advices ? Thank you .
> 
>          I also try to .devs ==> Res.mmio(0x7f008000, 0x7f00813f);
>                             .lcd.c ==>l4io_request_iomem(0x7f008000,
>        0x03f, L4IO_MEM_NONCACHED, &lcd_gpio_virt_base);
>                              when
>        "l4_mem_write(lcd_gpio_virt_base+0x100,L4_MEM_WIDTH_4BYTE,0xaaaaaaaa);
>        The offset 0x00 ,and 0x04 same problem ,but  now I can write
>        0xaaaaaaaa for this IO port,  even though working not well .

What I notice is that you want to have 0x7f008100, however, mappings are
page granular, i.e. lower 3 digits are 0. The output says the virt_base
is 0x4000, so you probably want to access 0x4100. Maybe the device at
offset 0 is behaving like what you're seeing.




Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/