Re: kernel loading

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

Nick Hudson <nick.hudson%gmx.co.uk@localhost> wrote:
>On 10/11/2018 19:45, Robert Swindells wrote:
>> 
>> How is loading and running of a 32-bit kernel by u-boot expected to
>> work ?
>> 
>> I have copied std.generic and mk.generic to use with fdt zynq sources.
>> 
>> The kernel_noload flag to mkubootimage(1) looks to make u-boot execute
>> the kernel in place. What address should I load netbsd.ub at ?
>
>your uboot "should" have a kernel_addr_r and a fdt_addr_r variable for 
>where it'll load the kernel and FDT.  The kernel should be aligned to a 
>least L1_S_SIZE (10x00100000).  I guess your old u-boot doesn't.
>
>http://src.illumos.org/source/xref/netbsd-src/sys/arch/arm/include/arm32/pte.h#100
>
>The netbsd.ub is loaded at the aligned address with the header and the 
>code is straight after the header, ie. at an offset of 64 bytes.

Ok, thanks.

I have got further by using -T kernel for the u-boot image with it
linked at the second L1 boundary.

Maybe we will need a PARALLELLA kernel as well as ZYNQ or GENERIC with
them built from the same sources but linked at different addresses.