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Re: [directfb-dev] Usage of mmap command

To: kaka <share.kt@gmail.com>
Subject: Re: [directfb-dev] Usage of mmap command
From: Denis Oliver Kropp <dok@directfb.org>
Date: Tue, 20 Nov 2007 09:29:35 +0100
Cc: linux-mips@linux-mips.org, uclinux-dev@uclinux.org, celinux-dev@tree.celinuxforum.org, linux-fbdev-users@lists.sourceforge.net, directfb-users@directfb.org, directfb-dev@directfb.org
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kaka wrote:
> Hi All,
> 
> void *mmap(void *start, size_t length, int prot, int flags,           int
> fd, off_t offset);
> 
> I am providing 16,00,000 as length parameter in mmap command.
> It is giving me error as Can't mmap region. on the other hand when i am
> providing 9,00,000 as length parameter in mmap command.
> It is successful.
> This mmap command is being issued from User space.
> 
> On the other hand in the framebuffer driver in the kernel spce i have
> specified the length of mmio in the ioremap as 16,00,000.

The ioremap() is independent of the values propagated to user space
and fbmem.c via fix.mmio_start and fix.mmio_len, please check these.

-- 
Best regards,
  Denis Oliver Kropp

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