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[Bug 1122614] armv7 efistub enablement missing in GRUB2
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 22 Jul 2019 09:36:40 +0000
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--- Comment #47 from Chester Lin <clin@xxxxxxxx> ---
(In reply to Guillaume GARDET from comment #45)
(In reply to Guillaume GARDET from comment #44)

I asked upstream to move this reserved 4KiB of RAM upper in memory:
Let's see how it goes.

As expected, we should not expect much from upstream:

And we should find a proper solution in kernel.

In fact, I also did another experiment, which loaded the uncompressed kernel at
0x1000 without calling round_up(dram_base, SZ_128M), and the kernel could still
boot up although it needs more code changes in arch/arm/mm/mmu.c. In this
experiment I changed adjust_lowmem_bounds() a little bit so that the
memblock_limit would not stick with 0x1000 due to PMD_SIZE alignment check
otherwise the kernel could fail to reserve CMA region.

Is there any reason [e.g, cache performance] that the kernel base must align
with 128MB? Is it possibie to round up with less alignment size such as

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