Re: Porting barebox to Novena: misc questions

[Sascha Hauer <s.hauer@pengutronix.de>]

On Thu, Mar 13, 2014 at 06:18:44PM +0800, Sean Cross wrote:
> On 13/3/14 3:38 PM, 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
> > 
> > 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.
> 
> This was caused by the default environment I imported.  It set
> "ip=dhcp", which I guess caused it to try and obtain an address.  I've
> set it to "ip=none" for now, and the problem has gone away.
> 
> >> 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?
> 
> I am probing from devicetree.  I don't see phys mentioned anywhere
> except in the imx6qdl.dtsi file, which means that in theory there
> shouldn't be anything for me to modify.

I can try to reproduce this tomorrow on a sabrelite board.

> Board: Kosagi i.MX6DL Novena Board
> detected i.MX6 DualLite revision 1.1
> ERROR: out of memory
> 
> [<5062e9ed>] (unwind_backtrace+0x1/0x74) from [<5061c525>] (panic+0x1d/0x34)
> [<5061c525>] (panic+0x1d/0x34) from [<5061cc27>] (xmemalign+0xf/0x14)
> [<5061cc27>] (xmemalign+0xf/0x14) from [<5062f687>] (mmu_init+0x16b/0x1f8)
> [<5062f687>] (mmu_init+0x16b/0x1f8) from [<50600797>]
> (start_barebox+0x1b/0xd0)
> [<50600797>] (start_barebox+0x1b/0xd0) from [<5062efcd>] (__start+0x91/0xa4)
> [<5062efcd>] (__start+0x91/0xa4) from [<50600005>]
> (__bare_init_start+0x1/0xc)
> ### ERROR ### Please RESET the board ###
> 
> If I also enable early MMU, it hangs much much earlier.  When I dug into
> it, it looked like it was trying to place a TTB just outside of the
> allocated memory region, for some reason.
> 
> This is with me passing SZ_1G to barebox_arm_entry().  If I pass
> something small like SZ_64M, it hangs completely.  If I instead pass it
> SZ_128M, it works just fine, but of course the MMU still doesn't work.

I suspect you have some memory setting that doesn't work in your
.config. Could you post it? Particularly the addresses in your backtrace
are outside the reachable memory (0x10000000 + 1GiB = 0x50000000). This
should not happen. Do you have CONFIG_RELOCATABLE enabled? If not, make
sure CONFIG_ARCH_TEXT_BASE is inside the memory you pass to
barebox_arm_entry(). Otherwise the autodetection for usable malloc area
space might produce wrong results.

Sascha

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