Hi All,
environment : X86-64 , kernel 3.16.0(64-bit support),grub2.02
I compile the grub2.02 by default. And the grub boots the linux kernel with
32-bit boot protocol.(Documents/X86/boot.txt)
I want to use the initrd as big as possible, but it is limited as follows.
But when I make a image-initrd that size is 1.75G(no compression), the grub can
boot linux normal .
It seems good for initrd size between 0x37feffff-0x3fffffff.But the grub seems
it is against that.
So I have some questions:
1、Why it is necessary to make sure that ADDR_MAX does not exceed 0x3fffffff ?
Has it a relationship about the 32-bit kernel?
2、Can I set addr_max=0x3fFFFFFF when (grub_le_to_cpu16 (linux_params.version)
>= 0x0203?
include/grub/i386/linux.h
#define GRUB_LINUX_INITRD_MAX_ADDRESS 0x37FFFFFF
grub-core/loader/i386/linux.c
grub_cmd_initrd:
/* Get the highest address available for the initrd. */
if (grub_le_to_cpu16 (linux_params.version) >= 0x0203)
{
addr_max = grub_cpu_to_le32 (linux_params.initrd_addr_max);
/* XXX in reality, Linux specifies a bogus value, so
it is necessary to make sure that ADDR_MAX does not exceed
0x3fffffff. */
if (addr_max > GRUB_LINUX_INITRD_MAX_ADDRESS)
addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS;
}
else
addr_max = GRUB_LINUX_INITRD_MAX_ADDRESS;_______________________________________________
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