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From: Alexander Graf <agraf@suse.de>
To: grub-devel@gnu.org
Cc: Leif Lindholm <leif.lindholm@linaro.org>,
	Peter Jones <pjones@redhat.com>, Jon Masters <jcm@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: [PATCH v2 0/2] arm64: Support HP Envy X2
Date: Sun, 23 Dec 2018 03:52:05 +0100	[thread overview]
Message-ID: <20181223025207.40755-1-agraf@suse.de> (raw)

I got a new toy this week: An HP Envy X2 system. This is one of those shiny
new Qualcomm Snapdragon based Windows tablet/notebook hybrid things.

While running Windows on those is actually not a terribly bad experience now
that WSL is out, I would like to see Linux run on those as well in the future.

Unfortunately as far as I'm aware so far nobody was able to run self built
binaries on the built-in UEFI version.

Turns out, it's a problem with aligning the start of the header to 4k. Once
we do that, binaries can be loaded just fine and run.

The reason behind that is simple: Its firmware tries to ensure NX protection
flags and can do so only when the code is 4K aligned.

So to maintain compatibility with that device, this patch set just bumps the
header alignment to 4K always on arm64-efi. This way we improve overall
compatibility - there surely will be more devices coming with similar
constraints.

v1 -> v2:

  - Remove explicit device wording from patch
  - Use GRUB_EFI_PAGE_SIZE

Alexander Graf (2):
  mkimage: Simplify header size logic
  mkimage: arm64-efi: Align first section to page

 util/mkimage.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

-- 
2.12.3



             reply	other threads:[~2018-12-23  2:52 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-23  2:52 Alexander Graf [this message]
2018-12-23  2:52 ` [PATCH v2 1/2] mkimage: Simplify header size logic Alexander Graf
2019-01-14 13:29   ` Daniel Kiper
2018-12-23  2:52 ` [PATCH v2 2/2] mkimage: arm64-efi: Align first section to page Alexander Graf
2019-01-14 13:37   ` Daniel Kiper
2019-01-14 13:41     ` Alexander Graf
2019-01-14 14:21       ` Leif Lindholm
2019-01-07  9:58 ` [PATCH v2 0/2] arm64: Support HP Envy X2 Leif Lindholm

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