Re: Where to load evbearm7hf-el GENERIC kernel?

On 17/03/2024 20:11, Lloyd Parkes wrote:
> Kia ora koutou,
> I'm fooling about trying to get NetBSD going on my ALINX AX7021 which is
> a Zynq based board.
>
> My immediate problem is that the AX7021 Petalinux U-Boot is implemented
> differently from the Zybo that I'm used to. On the AX7021 U-Boot appears
> to be built in to BOOT.BIN making it slightly tricky to swap out and the
> AX7021 U-Boot wants to load a FIT image which I don't entirely know how
> to make.
>
> In order to reduce the number of variables I'm working with, can anyone
> tell me what address the kernel expects to be loaded at and what the
> entry point is for an evbearm7hf-el GENERIC kernel?

For kernels built with __HAVE_GENERIC_START and armv6_start.S it doesn't
matter where in memory kernels are loaded apart from the alignment
requirements. Typically the 64 (0x40) byte u-boot header is dealt with
using (example from std.generic)

# The physical address is chosen by u-boot and determined by armv6_start.S.
# The 64 byte offset is due to u-boot header.
makeoptions     KERNEL_BASE_PHYS="0x00000040"
makeoptions     KERNEL_BASE_VIRT="0x80000040"


Hopefully your u-boot understands "kernel_noload" (see mk.generic)

MKUBOOTIMAGEARGS=       -A arm -T kernel_noload -O linux -C none


I forget how to deal with a u-boot that doesn't understand
"kernel_noload" atm

Nick