U-Boot v2 aka Barebox

Indeed, we now have dt support in Barebox.

We should add the device tree support to the nios arch. I'll do that when I have time (or you ? :)).

Franck.

Nice suggestion, but as you guess, I'm new in embedded developpement, and I just discover devicetree feature.

Also, I can send you my minor update of altera_tse driver. I don't know (I mean, howto) push it back to barebox project.

Regards,

Christophe

I'd be happy to merge your changes.

Check your PM.

Franck.

Hi Franck,

Email send. Thanks.

On another side, I face a new trouble.

After fixing nios_sopc.h, barebox start, and I reach the prompt.

But shortly after, without notice, an exception is raised.

barebox@generic:/ iomem
0x00000000 - 0xffffffff (size 0x00000000) iomem
  0xc4000000 - 0xc41fffff (size 0x00200000) ssram0
  0xc5200000 - 0xc527ffff (size 0x00080000) onchip0
  0xc8000000 - 0xcfffffff (size 0x08000000) ram0
    0xcff30000 - 0xcff3ffff (size 0x00010000) stack
    0xcff40000 - 0xcff9ffff (size 0x00060000) malloc space
    0xcffa0000 - 0xcffeb7cb (size 0x0004b7cc) barebox
    0xcffeb7cc - 0xcffedd6b (size 0x000025a0) barebox data
    0xcffedd6c - 0xcfff3227 (size 0x000054bc) bss
  0xe0000000 - 0xe3ffffff (size 0x04000000) cfi_flash0
  0xe5000000 - 0xe5001fff (size 0x00002000) altera_tse0
  0xe5003000 - 0xe50033ff (size 0x00000400) altera_tse0
  0xe5003400 - 0xe500343f (size 0x00000040) altera_tse0
  0xe5003440 - 0xe500347f (size 0x00000040) altera_tse0
  0xe6000080 - 0xe600009f (size 0x00000020) altera_serial_jtag0
  0xe60000a0 - 0xe60000bf (size 0x00000020) altera_serial0
  0xe60000c0 - 0xe60000df (size 0x00000020) altera_serial1
barebox@generic:/
*** ERROR: unimplemented instruction @ c350fb40
# ## ERROR# ## Please RESET the board# ##

First, this never happen with our previous MPU design.

Second, It don't seems to occur when I "place" barebox at bottom of DDR3 (above 0xc8000000).

Third, instruction @ XXXX is random.

I give a look at nios2/lib/clock.c, and everything seems Ok. But I notice important side effect when I try some minor change on this file.

Linux kernel still running nicely.

Regards,

Christophe

Hi,

You should try to remove the more driver you can to check if one of them can cause this problem.

Franck.

Hi,

After investigation, I found that exception raise come from __muldi3 and other operand operation. (_mult is used by cyc2ns()).

Maybe it's not only barebox related issue, but when barebox is on top on ddr3 space (our range ddr3 is 0x800 0000 to 0xfff ffff), this exception occurs randomly (but at least 10s after starting).

Another strange fact is, clock_source function are based on uint64_t, and exception seems to come form __multdi3, which is long long typed !

In fact, this exception doesn't occur with the same Nios2 design without MMU and Linux (with MMU).

Regards,

Christophe

FPGA : Cyclone V Altera DevKit

Tools : Quartus 12.1 WebEdition