onion omega2+

[Mike Wolman]

Hi Adrian,

I am making the uImage from the kernel generated in tfpboot after the 
freebsd-wifi-build script is complete.

I had an issue with a compressed kernel with an lzma error so with help 
we jumped past that and have got a kernel to boot from a binary with:

objcopy -O binary kernel.MT7628_FDT kernel.MT7628_FDT.bin

and then on the omega just "go 0x80001100" but am unable to get "bootm 
0x80001100" working from uboot image still.

I am trying to get the complete wifi build so I have a filesystem and 
kernel image so was just following what I could find/understand in the 
wifi build stuff.

My current problem is I am not up on the hex address stuff and cannot 
workout what the correct load address should be for the u-boot image eg:

mkimage -A mips -O linux -T kernel -C none \
     -a 0x80000C00 -e 0x80001100 \
     -n "FreeBSD" -d kernel.MT7628_FDT kernel.MT7628_FDT.uImage

 From my searching i see it is also related to the file size so have 
tried various combinations but just am not getting further.

So info on the kernel:

-r-xr-xr-x  1 mike  mike   5623376 May 10 20:49 kernel.MT7628_FDT

[mike at f64-current ~/omega2/tftpboot]$ readelf -h kernel.MT7628_FDT
ELF Header:
   Magic:   7f 45 4c 46 01 01 01 09 00 00 00 00 00 00 00 00
   Class:                             ELF32
   Data:                              2's complement, little endian
   Version:                           1 (current)
   OS/ABI:                            FreeBSD
   ABI Version:                       0
   Type:                              EXEC (Executable file)
   Machine:                           MIPS R3000 Big-Endian only
   Version:                           0x1
   Entry point address:               0x80001100
   Start of program headers:          52 (bytes into file)
   Start of section headers:          5622096 (bytes into file)
   Flags:                             0x50001001, mips32, o32, noreorder
   Size of this header:               52 (bytes)
   Size of program headers:           32 (bytes)
   Number of program headers:         6
   Size of section headers:           40 (bytes)
   Number of section headers:         32
   Section header string table index: 29



Also just to clarify - when using fatload the address i should use 
should NOT be the load or entry address ie use something like:

fatload usb 0:1 0x80800000 kernel.MT7628_FDT.uImage
bootm 0x8000XXXXX


Where0x8000XXXXX is the load address?

Thanks

Mike.

On 11/05/2017 00:20, Adrian Chadd wrote:
> Hi,
>
> Ah, you're doing XIP. I haven't done XIP before; i typically just
> generate a normal image and give it a separate load address 16MB or
> something into physical memory so I don't overwrite it.
>
> Ie, when you use mkimage to create a uboot application, you provide it
> /both/ a load address and a run address. So, eg, for MIPS we do this:
>
> * load: 0x80050000
> * run: 0x80050100
>
> .. the 256 bytes is space for the ELF header. And in the std.AR*
> files, we specify the run address is 0x80050100 to ensure it all lines
> up.
>
> Then to bootm i load it somewhere else away from that load address, so
> it gets copied to the right spot and run.
>
>
>
> -adrian