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why does the framebuffer on i386 vmware is read-only!
- From: sonys zhang <zhang_sonys at yahoo dot com dot cn>
- To: ecos-discuss <ecos-discuss at sources dot redhat dot com>
- Date: Mon, 25 Aug 2003 15:24:15 +0800 (CST)
- Subject: [ECOS] why does the framebuffer on i386 vmware is read-only!
Hi everyone,
I built ecos on i386 pc target, and run it on vmware
with redboot load it. I have configured redboot to
"switch the display to an alternative video mode" with
the value "0x013f", this value in vmware is "Mode
013f: 640* 480 @ 32bpp, 2560 bytes/line, fb yes
0xf5000000"(this i dump with ecos microwin
GdOpenScreen function). So, the address of framebuffer
is 0xf5000000. And GdOpenScreen will fillrect this
area to be 0 before return. But I dump the memory of
this area(0xf5000000~) with i386-elf-gdb, it still be
0xffffffff. And I set the memory of this area to be 0
by hand, it still be 0xffffffff. It looks like that,
this area is a read-only area. But the
ecos_pcsvga_open function told me that, this
area(0xf5000000~) is the framebuffer. How does this
happen?
Any suggestions is appreciated.
Brs
Sonys
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