[U-Boot] [RFC] Reserve ATF memory on Marvell Armdada 3700/7K/8K

[Patrick Wildt <patrick@blueri.se>]

On Fri, Apr 06, 2018 at 12:22:03PM +0200, Alexander Graf wrote:
> On 31.03.18 16:13, Mark Kettenis wrote:
> > Currently U-Boot doesn't make any effort to reserve the memory used by
> > ARM Trusted Firmware on these platforms.  The result is that the
> > memory is listed as available in the EFI memory map.  And as soon as a
> > loaded kernel tries to use this memory things explode.  I've seen this
> > with the OpenBSD kernel.  But I totally expect a Linux kernel to
> > suffer the same fate.
> > 
> > I'm currently using the diff below, but it is not entirely clear to me
> > if arch_early_init_r() is the appropriate place to do this.  I'm also
> > wondering whether the block should also be marked as reserved in the
> > FDT using fdt_add_mem_rsv().  If the latter is required this probably
> > needs to be done by ft_board_setup() or ft_system_setup().
> > 
> > The address and size of the region have been taken from Marvell's ATF
> > fork at
> > 
> >   https://github.com/MarvellEmbeddedProcessors/atf-marvell
> > 
> > The memory layout is defined in
> > 
> >   plat/marvell/a8k/common/include/platform_def.h
> > 
> > where there are lots of defines and a diagram that attempt to describe
> > the memory.  It is not entirely obvious to me what part needs to be
> > reserved.  But 0x0400000-0x04200000 works.
> > 
> > 
> > 
> > 
> > diff --git a/arch/arm/mach-mvebu/arm64-common.c b/arch/arm/mach-mvebu/arm64-common.c
> > index 3c84043a2c..895cd2852f 100644
> > --- a/arch/arm/mach-mvebu/arm64-common.c
> > +++ b/arch/arm/mach-mvebu/arm64-common.c
> > @@ -95,5 +95,11 @@ int arch_early_init_r(void)
> >  	pci_init();
> >  #endif
> >  
> > +#ifdef CONFIG_EFI_LOADER
> > +	/* Reserve trusted SRAM section */
> > +	efi_add_memory_map(0x04000000, 0x00200000 >> EFI_PAGE_SHIFT,
> > +			   EFI_RESERVED_MEMORY_TYPE, false);
> 
> I also forgot to comment here. 2MB is probably not enough:
> 
> 
> https://github.com/MarvellEmbeddedProcessors/atf-marvell/blob/atf-v1.3-armada-17.10/plat/marvell/a8k/common/include/platform_def.h#L110
> 
> That sounds more like it should span 65MB (PLAT_MARVELL_TRUSTED_ROM_SIZE
> plus 0x100000).
> 
> Looking at what edk2 does, it seems to use the same range as you:
> 
> 
> https://github.com/MarvellEmbeddedProcessors/edk2-open-platform/blob/marvell-armada-wip/Platforms/Marvell/Armada/Armada.dsc.inc#L347
> 
> So let's also CC Marcin :). Maybe his range is too short!
> 
> 
> Alex
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The current ATF and EDK2 branch from Marvell seem to reserve a bit more.
I just had the same issue and am using this diff.  This then creates the
same map of usable memory as EDK2 does.

Best regards,
Patrick

diff --git a/arch/arm/mach-mvebu/arm64-common.c b/arch/arm/mach-mvebu/arm64-common.c
index 47bbf69944..56c0d3f6b9 100644
--- a/arch/arm/mach-mvebu/arm64-common.c
+++ b/arch/arm/mach-mvebu/arm64-common.c
@@ -14,6 +14,7 @@
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
 #include <asm/armv8/mmu.h>
+#include <efi_loader.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -142,5 +143,11 @@ int arch_early_init_r(void)
 	pci_init();
 #endif
 
+#ifdef CONFIG_EFI_LOADER
+	/* Reserve trusted SRAM section */
+	efi_add_memory_map(0x04000000, 0x01400000 >> EFI_PAGE_SHIFT,
+			   EFI_RESERVED_MEMORY_TYPE, false);
+#endif
+
 	return 0;
 }