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path: root/arch/x86/boot/a20.c
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2009-04-09x86, setup: "glove box" BIOS interrupts in the core boot codeH. Peter Anvin
Impact: BIOS proofing "Glove box" off BIOS interrupts in the core boot code. LKML-Reference: <49DE7F79.4030106@zytor.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2009-02-22x86: remove the Voyager 32-bit subarchIngo Molnar
Impact: remove unused/broken code The Voyager subarch last built successfully on the v2.6.26 kernel and has been stale since then and does not build on the v2.6.27, v2.6.28 and v2.6.29-rc5 kernels. No actual users beyond the maintainer reported this breakage. Patches were sent and most of the fixes were accepted but the discussion around how to do a few remaining issues cleanly fizzled out with no resolution and the code remained broken. In the v2.6.30 x86 tree development cycle 32-bit subarch support has been reworked and removed - and the Voyager code, beyond the build problems already known, needs serious and significant changes and probably a rewrite to support it. CONFIG_X86_VOYAGER has been marked BROKEN then. The maintainer has been notified but no patches have been sent so far to fix it. While all other subarchs have been converted to the new scheme, voyager is still broken. We'd prefer to receive patches which clean up the current situation in a constructive way, but even in case of removal there is no obstacle to add that support back after the issues have been sorted out in a mutually acceptable fashion. So remove this inactive code for now. Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-02-02x86 setup: a20: early timeout for a nonexistent keyboard controllerH. Peter Anvin
When probing the keyboard controller to enable A20, if we get FF back (which is *possible* as a valid status word, but is extremely unlikely) then bail after much fewer iterations than we otherwise would, and abort the attempt to access the KBC. This hopefully should make it work a lot better for embedded platforms which don't have a KBC and where the BIOS doesn't implement INT 15h AX=2401h (and doesn't boot with A20 already enabled.) If this works, it will be the one remaining use of CONFIG_X86_ELAN as anything other than a processor type optimization option. Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2008-07-08Merge branch 'x86/setup' into x86/develIngo Molnar
2008-06-27x86: setup: issue a null command after enabling A20 via KBCH. Peter Anvin
Apparently, DOS and possibly other legacy operating systems issued a null command to the keyboard controller after toggling A20, specifically "pulse output pins" with no output pins specified. This was presumably done for synchronization reasons. This has made it into at least the UHCI spec, and it has been found to cause compatibility problems when "legacy USB" is enabled (which it almost always is) to not have this byte sent. It is *NOT* clear if any of these compatibility problems has any effect on Linux. However, for maximum compatibility, issue this null command after togging A20 through the KBC. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2008-06-12x86: fix unused variable 'loops' warning in arch/x86/boot/a20.cManish Katiyar
Following patch fixes the below warning message : arch/x86/boot/a20.c:118: warning: unused variable 'loops' Signed-off-by : Manish Katiyar <mkatiyar@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-04-19x86: remove pointless commentsWANG Cong
Remove old comments that include the old arch/i386 directory. Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2007-10-11i386: move bootThomas Gleixner
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>