kaka wrote:
> Hi Denis,
>
> Thanks for the reply.
> I am writing gfxdriver for directFB library for broadcom chip.
> I have also written a frambuffer driver for broadcom chip.
Directly for broadcom or at another company?
> In directFB code,
>
> static volatile void *
> system_map_mmio( unsigned int offset,
> int length )
> {
> void *addr;
>
> if (length <= 0)
> length = dfb_fbdev->shared->fix.mmio_len;
>
> addr = mmap( NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED,
> dfb_fbdev->fd, dfb_fbdev->shared->fix.smem_len + offset );
> if ((int)(addr) == -1) {
> D_PERROR( "DirectFB/FBDev: Could not mmap MMIO region "
> "(offset %d, length %d)!\n", offset, length );
> return NULL;
> }
>
> return(volatile void*) ((u8*) addr + (dfb_fbdev->shared->fix.mmio_start&
> dfb_fbdev->shared->page_mask));
> }
Can you add printfs to show dfb_fbdev->shared->fix.mmio_start, mmio_len,
smem_start and smem_len?
> the length and offset i am providing as 0 and -1.
You mean offset 0 and length -1?
> It is throwing me error as Could not mmap MMIO region.
> length coming from dfb_fbdev->shared->fix.smem_len is 16,00,000.
1600000 = 1.6MB?
> When i change the code to addr = mmap( NULL, 900000, PROT_READ |
> PROT_WRITE, MAP_SHARED, dfb_fbdev->fd, dfb_fbdev->shared->fix.smem_len +
> offset );
You changed the length to 900000, but you need to use this to map offset
900000:
addr = mmap( NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED,
dfb_fbdev->fd, 900000 );
But it should work if you set smem_len to 900000 in the fb driver.
> Then it works fine but it is not allowing me to write to addresses with
> offset greater than 900000.
Segfault?
> My requirement is to write in to the MMIO registers with offset between
> 900000 and 16 00 000.
What exactly is your frame buffer size and physical MMIO address?
You need to put the frame buffer size into smem_len and the physical
MMIO address into mmio_start, the length into mmio_len.
--
Best regards,
Denis Oliver Kropp
.------------------------------------------.
| DirectFB - Hardware accelerated graphics |
| http://www.directfb.org/ |
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