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2010-06-29 Robert Millan <rmh@gnu.org>

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* docs/grub.texi (Simple configuration): Document ${GRUB_BADRAM}.
	(Command-line and menu entry commands): Document `badram' command.
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Robert Millan 2010-06-29 00:48:53 +02:00
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@ -1,3 +1,8 @@
2010-06-29 Robert Millan <rmh@gnu.org>
* docs/grub.texi (Simple configuration): Document ${GRUB_BADRAM}.
(Command-line and menu entry commands): Document `badram' command.
2010-06-28 Robert Millan <rmh@gnu.org>
* util/grub-mkconfig.in: Export `GRUB_BADRAM' variable.

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docs/grub.texi
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@ -1032,6 +1032,11 @@ for them. Set this option to @samp{true} to disable this.
Play a tune on the speaker when GRUB starts. This is particularly useful
for users unable to see the screen. The value of this option is passed
directly to @ref{play}.
@item GRUB_BADRAM
If this option is set, GRUB will issue a @ref{badram} command to filter
out specified regions of RAM.
@end table
For more detailed customisation of @command{grub-mkconfig}'s output, you may
@ -1804,6 +1809,7 @@ you forget a command, you can run the command @command{help}
@menu
* acpi:: Load ACPI tables
* badram:: Filter out bad regions of RAM
* blocklist:: Print a block list
* boot:: Start up your operating system
* cat:: Show the contents of a file
@ -1857,6 +1863,27 @@ Normally, this command will replace the Root System Description Pointer
GRUB, but may be used by GRUB's EFI emulation.
@end deffn
@node badram
@subsection badram
@deffn Command badram addr,mask[,addr,mask...]
Filter out bad RAM.
@end deffn
This command notifies the memory manager that specified regions of
RAM ought to be filtered out (usually, because they're damaged). This
remains in effect after a payload kernel has been loaded by GRUB, as
long as the loaded kernel obtains its memory map from GRUB. Kernels that
support this include Linux, GNU Mach, the kernel of FreeBSD and Multiboot
kernels in general.
Syntax is the same as provided by the @uref{http://www.memtest.org/,
Memtest86+ utility}: a list of address/mask pairs. Given a page-aligned
address and a base address / mask pair, if all the bits of the page-aligned
address that are enabled by the mask match with the base address, it means
this page is to be filtered. This syntax makes it easy to represent patterns
that are often result of memory damage, due to physical distribution of memory
cells.
@node blocklist
@subsection blocklist