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Impact: fix "garbled display, laptop is unusable" bug
Commit e51a1ac2dfca9ad869471e88f828281db7e810c0 ("x86, olpc: fix endian
bug in openfirmware workaround") breaks model comparison on OLPC; the value
0xc2 needs to be scaled up by olpc_board().
The pre-patch version was wrong, but accidentally worked anyway
(big-endian 0xc2 is big enough to satisfy all other board revisions,
but little endian 0xc2 is not).
Signed-off-by: Chris Ball <cjb@laptop.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Boardrev is always treated as a u32 everywhere else, no reason to
byteswap the 0xc2 value. The only use is to print out if it is
a prerelease board, the test being:
(olpc_platform_info.boardrev & 0xf) < 8
Which is currently always true as be32_to_cpu(0xc2) & 0xf = 0
but I doubt that was the intention here. The consequences of the bug
are pretty minor though (incorrect boardrev displayed in dmesg when
ofw support not configured)
Also annotate the temporary used to read the boardrev in the ofw
case.
The confusion was noticed by Sparse:
arch/x86/kernel/olpc.c:206:32: warning: cast to restricted __be32
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This adds support for OLPC XO hardware. Open Firmware on XOs don't contain
the VSA, so it is necessary to emulate the PCI BARs in the kernel. This also
adds functionality for running EC commands, and a CONFIG_OLPC.
A number of OLPC drivers depend upon CONFIG_OLPC.
olpc_ec_timeout is a hack to work around Embedded Controller bugs.
[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: geode_has_vsa build fix]
[akpm@linux-foundation.org: olpc_register_battery_callback doesn't exist]
Signed-off-by: Andres Salomon <dilinger@debian.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Chris Ball
Harvey Harrison
Andres Salomon