From: kaka <share.kt@gmail.com>
To: linux-mips@linux-mips.org, uclinux-dev@uclinux.org,
celinux-dev@tree.celinuxforum.org,
linux-fbdev-users@lists.sourceforge.net
Cc: directfb-users@directfb.org, directfb-dev@directfb.org
Subject: Usage of mmap command(in directFB)
Date: Sun, 25 Nov 2007 17:59:30 +0530 [thread overview]
Message-ID: <eea8a9c90711250429v3de6b33ra00fecb39e81a8a7@mail.gmail.com> (raw)
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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
--
Thanks & Regards,
kaka
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reply other threads:[~2007-11-25 12:29 UTC|newest]
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