Orange Pi One

[Ian Lepore]

On Tue, 2016-04-19 at 09:53 +0200, Milan Obuch wrote:
> On Tue, 19 Apr 2016 09:34:08 +0200
> Emmanuel Vadot <manu at bidouilliste.com> wrote:
> 
> > On Tue, 19 Apr 2016 09:20:12 +0200
> > Milan Obuch <freebsd-arm at dino.sk> wrote:
> > 
> > > 
> > > One step further - compiled ubldr as part of buildworld, tried,
> > > and
> > > found I need ubldr.bin to start boot process, ubldr just keeps
> > > crashing with following:
> > > 
> > > Booting from: mmc 0 ubldr
> > > reading ubldr
> > > 235312 bytes read in 63 ms (3.6 MiB/s)
> > > ## Starting application at 0x01000098 ...
> > > undefined instruction
> > > pc : [<01c0f00c>]	   lr : [<5ff77138>]
> > > reloc pc : [<ebc9f00c>]	   lr : [<4a007138>]
> > > sp : 5bf4ba70  ip : 00000030	 fp : 5ff76ffc
> > > r10: 00000001  r9 : 5bf4fee8	 r8 : 00000000
> > > r7 : 00000001  r6 : 5bf513e0	 r5 : 01000098  r4 : 00000000
> > > r3 : 00000001  r2 : 01c28000	 r1 : 5bf513e4  r0 : 00000000
> > > Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> > > Resetting CPU ...
> > > 
> > > resetting ...
> > > 
> > > but ubldr.bin works (command typed manually):
> > >   
> > > => fatload mmc 0 0x42000000 ubldr.bin  
> > > reading ubldr.bin
> > > 192096 bytes read in 58 ms (3.2 MiB/s)  
> > > => go 0x42000000  
> > > ## Starting application at 0x42000000 ...
> > > Consoles: U-Boot console  
> > > Compatible U-Boot API signature found @0x5bf504c8
> > > 
> > > FreeBSD/arm U-Boot loader, Revision 1.2
> > > (root at zeta.dino.sk, Tue Apr 19 06:33:11 CEST 2016)
> > > 
> > > DRAM: 512MB
> > > MMC Device 1 not found
> > > Number of U-Boot devices: 1
> > > U-Boot env: loaderdev='mmc 0'
> > > Found U-Boot device: disk
> > >   Checking unit=0 slice=<auto> partition=<auto>... good.
> > > Booting from disk0s1:
> > > -
> > > can't load 'kernel'
> > > 
> > > Type '?' for a list of commands, 'help' for more detailed help.  
> > > loader>  
> > > 
> > > Now I can type loader command, so I can try to load kernel if I
> > > had
> > > one (I tried to build it from stock FreeBSD sources, but
> > > something
> > > was wrong, I must figure why buildkernel did not produce
> > > kernel...
> > > just testing now, waiting where it breaks).
> > > 
> > > Milan  
> > 
> >  For ubldr to work you need to set UBLDR_LOADADDR variable to the
> > correct address.
> > 
> 
> Where is this defined? Or should be? Not top important issue now, as
> I
> can continue with ubldr.bin for some time, but I still would like to
> check it.
> 

Actually, ubldr (the elf version) shouldn't even exist anymore.  Once I
got the relocation worked out for ubldr.bin, the plan was always to
eliminate the elf version and have just the .bin file.  I left the elf
file around to allow time for crochet and other scripts to adjust
(which I think probably never happened).

FreeBSD image building (for snapshots and releases) was supposed to
transition to a new mechanism which built a single world for all
supported systems, and a board-specific kernel for each supported
board.  The only way to build a single world for all images is to
eliminate the elf ubldr which has to be compiled differently for each
board.

-- Ian