Re: [PATCH v3 06/10] arm64: efi: add EFI stub

From: Timur Tabi
Date: Wed Feb 08 2017 - 11:36:04 EST

On 02/08/2017 10:29 AM, Ard Biesheuvel wrote:
>> + status = handle_cmdline_files(sys_table, image, cmdline_ptr,
>> + "initrd=", dram_base + SZ_512M,
>> + (unsigned long *)&initrd_addr,
>> + (unsigned long *)&initrd_size);
> So I know this patch is almost three years old, but why is there a
> 512M limit on the initrd size?
How do you reckon this constitutes a limit?

handle_cmdline_files() calls efi_high_alloc() with that limit. I'm still trying to understand all the details myself, but apparently our firmware and initrd need to fit within the first 512MB because of dram_base + SZ_512M. When we change "dram_base + SZ_512M" to "~0", everything works.

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