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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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