Re: [ARM11] Question for the ARM 11 GPIO MAPPING

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