Problem in the usage of mmap command(in directFB)

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>
> 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
>

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<div>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div>Hi All,</div>
<div>&nbsp;</div>
<div>void *mmap(void *start, size_t length, int prot, int flags,&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; int<br>fd, off_t offset);<br>&nbsp;</div>
<div>I am providing&nbsp;1.6MB as length parameter in mmap command.</div>
<div>It is giving me error as Can&#39;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</div>
<div>&nbsp;</div>
<div>on the other hand when i am providing&nbsp;1.384MB as length parameter in mmap command.</div>
<div>It is successful.<br clear="all">This mmap command is being issued from User space(from the DIrectFB code in systems/fbdev.c)</div>
<div>&nbsp;</div>
<div>The exact command which i am writing is </div>
<div>addr = mmap(NULL, dfb_fbdev-&gt;shared-&gt;fix.mmio_len, PROT_READ | PROT_WRITE, MAO_SHARED, dfb_fbdev-&gt;fd, 0);</div>
<div>&nbsp;</div>
<div>Can anybody provide any clue on it?</div>
<div>I want to access the mmio regs at offset (0.9MB to 1.6MB offset).</div>
<div>Also&nbsp;in my system MIPS board(broadcom chip), the framebuffer driver contains support for MMIO length as 1.6MB. </div>
<div><br>-- <br>Thanks &amp; Regards,<br>kaka </div></blockquote></div>

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