My understanding is that the problem is something to do with the
Toshiba Tecra laptops not flushing the cache properly when activating
the A20 line. This causes a problem for bzImage kernels because they
decompress into extended memory, whereas zImage kernels don't and
thus don't tickle the bug.
Unfortunately, I haven't seen a proper technical description of the problem
nor any workaround or patch.
Earlier versions of Debian Linux e.g. 2.1 (the distro that I use) used to
special "Tecra" kernels because of this problem.
Alan Cox said in a previous message in this thread:
ac>If your tecra is one with the problem early intel PCI chipsets the
ac>documentation on the workaround is on the intel.com site if you feel
ac>Basically the A20 handling for hardware caches on some of these early chips
ac>was broken. There were real hardware fixes for new boards and a software
ac>workaround for old ones is described in the errata docs for the chip.
This sounds about right, but I've not been able to locate the info on Intel's
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