[Linux-fbdev-users] Problem in the usage of mmap command(in directFB)

[kaka <sha...@gm...>]

>
> Hi All,
>
> void *mmap(void *start, size_t length, int prot, int flags,           int
> fd, off_t offset);
>
> I am providing 1.6MB as length parameter in mmap command.
> It is giving me error as Can't mmap region with error number EINVAL. I
> searched for the probable causes for EINVAL error number, and cheked it that
> i am satisfying all of them
>
> on the other hand when i am providing 1.384MB as length parameter in mmap
> command.
> It is successful.
> This mmap command is being issued from User space(from the DIrectFB code
> in systems/fbdev.c)
>
> The exact command which i am writing is
> addr = mmap(NULL, dfb_fbdev->shared->fix.mmio_len, PROT_READ | PROT_WRITE,
> MAO_SHARED, dfb_fbdev->fd, 0);
>
> Can anybody provide any clue on it?
> I want to access the mmio regs at offset (0.9MB to 1.6MB offset).
> Also in my system MIPS board(broadcom chip), the framebuffer driver
> contains support for MMIO length as 1.6MB.
>
> --
> Thanks & Regards,
> kaka
>