Re: Porting barebox to Novena: misc questions

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 08:38 Thu 13 Mar     , Sascha Hauer wrote:
> Hi Sean,
> 
> On Thu, Mar 13, 2014 at 10:04:35AM +0800, Sean Cross wrote:
> > Hi,
> > 
> > I've finally managed to get U-Boot's SPL to configure DDR3 and load
> > barebox off of a FAT partition on an i.MX6DL.  I also have a barebox
> > build with most features turned on, and I'm running into a number of
> > problems.  barebox is able to load a zImage off of the FAT partition,
> > set up ATAGs, and jump to it.  So I have the basics done.  But there are
> > lots of little things that aren't working.
> > 
> > When I boot without an Ethernet cable plugged in, the "timeout" command
> > takes a very long time to complete.  It generally freezes at "Hit any
> > key to stop autoboot:  3" and tends to ignore input for around ten
> > seconds.  How can I prevent this from happening, short of compiling out
> > FEC support?
> 
> Are you trying to start from network without a cable plugged in? When I
> start from network without a cable I get:
> 
> running /env/bin/init...
> 
> Hit m for menu or any other key to stop autoboot:  1
> blspec: blspec_scan_directory: net loader/entries
> booting net
> dhcp failed: Network is down
> dhcp: Network is down
> 

I get the same issue on Calao USB keys

this is quite anoying

can we fix it

Best Regards,
J.
> It indeed takes some seconds until we are sure that the link is down.
> That timeout could be reduced, but we must give the phy some time to
> bring up the link.
> 
> Or does this happen when you are not trying to boot from network at all?
> That shouldn't happen. If it does, maybe some automount command triggers
> network accesses.
> 
> > 
> > The "usb" command just hangs the system.  It should at least detect the
> > other ASIX Ethernet port.  I have &usbh1 configured identically to
> > sabrelite.  Is there something else I need to configure?
> 
> This usually means the phys are not configured correctly. Are you
> probing from devicetree?
> 
> > 
> > The "usbserial" command returns "usbserial: No such device".  Like usb,
> > I have &usbotg configured the same as sabrelite.  It doesn't work with
> > dr_mode set to either "host" or "otg".
> 
> Ok, from devicetree it seems. I can say that there shouldn't be any bugs
> in the common usb code preventing your devices from being probed. It
> normally boils down to some usbmisc register setting being wrong.
> 
> > 
> > How can I pass the correct ram size to Linux?  The comment on
> > barebox_arm_entry() notes that "[memsize] doesn't necessarily have to be
> > the full SDRAM", and indeed I notice that barebox hangs if I pass it the
> > full 3840 MB passed from U-Boot.  So I'm currently limiting it to 1GB in
> > my start_imx6dl_kosagi_novena_6dl routine.  Do I need to somehow add the
> > remainder as another bank somewhere?  Or modify the bank size in my
> > kosagi_novena_init() in board.c?
> 
> If you probe from devicetree the correct amount of memory is taken from
> there. If that doesn't work (dynamic amount of memory for example) you
> can set the memory in the devicetree to 0 and call arm_add_mem_device
> instead.
> 
> > 
> > Finally, I was unable to get barebox to boot with MMU support.  For some
> > reason it kept trying to allocate memory just outside of allocated RAM.
> 
> This is related to the wrong memory setup. That should be solved when
> you get that straight.
> 
> >  Is there any benefit to running with the MMU enabled on i.MX6?
> 
> Definitely, yes. barebox runs much faster with MMU enabled.
> 
> Sascha
> 
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