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[PATCH] docs: workaround for grub-mkrescue with older MacBooks


From: Thomas Schmitt
Subject: [PATCH] docs: workaround for grub-mkrescue with older MacBooks
Date: Thu, 20 Jun 2019 10:36:42 +0200

Description of the workaround for firmware of older MacBooks which
stalls with a grub-mkrescue ISO image for platform "x86_64-efi" on
a USB stick.

Signed-off-by: Thomas Schmitt <address@hidden>
---

diff --git a/docs/grub.texi b/docs/grub.texi
index 308b250..a9b38e9 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -6131,6 +6131,7 @@ Required files are:

 @menu
 * GRUB only offers a rescue shell::
+* Firmware stalls instead of booting GRUB::
 @end menu


@@ -6201,6 +6202,17 @@ support has not yet been added to GRUB.
 @end itemize


+@node Firmware stalls instead of booting GRUB
+@section Firmware stalls instead of booting GRUB
+
+The EFI implementation of some older MacBook laptops stalls when it gets
+presented a grub-mkrescue ISO image for platform "x86_64-efi" on a
+USB stick. Affected are models of year 2010 or earlier.
+Workaround is to zeroize the bytes 446 to 461 of the EFI partition, where
+mformat has put a partition table entry which claims partition start at
+block 0. This change will not hamper bootability on other machines.
+
+
 @node Invoking grub-install
 @chapter Invoking grub-install




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