Messages in this thread Patch in this message | | | Date | Mon, 10 Jul 2000 09:22:28 -0400 (EDT) | From | James Simmons <> | Subject | Re: [report of:] Re: MDA video detection request. |
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Here is a patch developed by Matan that correctly detects if a mda card is really presents. It works for millienium card and he tested on a few others cards with sucess. Please test it on as many cards as possible to make sure it fixes the reported problems. Thank you.
Q: Why did they deprecate a.out support in linux? A: Because a nasty coff is bad for your elf.
James Simmons [jsimmons@linux-fbdev.org] ____/| fbdev/console/gfx developer \ o.O| http://www.linux-fbdev.org =(_)= http://linuxgfx.sourceforge.net U http://linuxconsole.sourceforge.net
--- mdacon.c.orig Mon Jul 10 09:15:36 2000 +++ mdacon.c Mon Jul 10 09:18:05 2000 @@ -133,14 +133,20 @@ static int test_mda_b(unsigned char val, unsigned char reg) { unsigned long flags; + unsigned char save; save_flags(flags); cli(); outb_p(reg, mda_index_port); - outb (val, mda_value_port); + udelay(20); + save = inb_p(mda_value_port); + udelay(20); + outb(val, mda_value_port); udelay(20); val = (inb_p(mda_value_port) == val); + udelay(20); + outb_p(save, mda_value_port); restore_flags(flags); return val; @@ -246,14 +252,14 @@ /* Edward: These two mess `tests' mess up my cursor on bootup */ /* cursor low register */ - /* if (! test_mda_b(0x66, 0x0f)) { + if (! test_mda_b(0x66, 0x0f)) { return 0; - } */ + } /* cursor low register */ - /* if (! test_mda_b(0x99, 0x0f)) { + if (! test_mda_b(0x99, 0x0f)) { return 0; - } */ + } /* See if the card is a Hercules, by checking whether the vsync * bit of the status register is changing. This test lasts for
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