Hi, Yau
I had a very similar problem with my project. It was sufficient for me to add "u-boot,dm-pre-reloc" stanza to cpu node only. This is necessary to properly setup mmu/nommu-related memory mappings. Other nodes remain unchanged.
The resulting cpu node (omitting details) is as follows:
cpu: cpu@0x0 { device_type = "cpu"; compatible = "altr,nios2-16.0", "altr,nios2-1.1"; reg = <0x00000000>; u-boot,dm-pre-reloc; .... }
This works for my custom no-mmu project. Unfortunately, I cannot test this solution on other boards.
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On Thu Jul 6 14:30:54 UTC 2017 Gan, Yau Wai wrote:
I tried adding the dm-pre-reloc line to every node and sub-node, but it doesn’t help.
On 06/07/2017, 8:26 PM, "Lothar Waßmann" <LW at KARO-electronics.de> wrote:
Hi,
On Thu, 6 Jul 2017 10:32:57 +0000 Gan, Yau Wai wrote:
U-boot for Nios II on the 10m50 dev board is not functioning. The serial terminal prints nothing upon booting up. The u-boot image is loaded via GDB/JTAG to the FPGA on-chip RAM.
Bisect activities were carried and discovered that the change from using dm_scan_fdt_node to dm_scan_fdt_dev in the simple_bus.c. This leads to suspecting the 10m50_devboard.dts need update to include "u-boot,dm-pre-reloc".
u-boot,dm-pre-reloc has to be present in each item of the DT path leading to the node where you need it.
Lothar Waßmann