U-Boot for Raspberry Pi, step 2

May 26, 2012 — 3 Comments

I had some issues with console output from U-Boot on my R-Pi but Alexander Rybalko submitted patch that seems to fix them. One more issue that needed to be resolved: mysterious hangs in relocate_code. Some digging revealed that system hangs once PC reaches address 0×100. Some more digging yielded that at this address is used by GPU part of loader to store arguments for kernel.

So after tweaking .text offset for u-boot and generating proper image using this tool I finally got:

monitor len: 0001A14C
ramsize: 08000000
Top of RAM usable for U-Boot at: 08000000
Reserving 104k for U-Boot at: 07fe5000
Reserving 1216k for malloc() at: 07eb5000
Reserving 32 Bytes for Board Info at: 07eb4fe0
Reserving 120 Bytes for Global Data at: 07eb4f68
New Stack Pointer is: 07eb4f58
RAM Configuration:
Bank #0: 00000000 128 MiB
relocation Offset is: 07fdd000
memcpy(07eb4f68, 03ffff80, 120)
relocate_code(07eb4f58, 07eb4f68, 07fe5000)
WARNING: Caches not enabled
monitor flash len: 00019124
Now running in RAM - U-Boot at: 07fe5000
Using default environment

Destroy Hash Table: 07ffb58c table = (null)
Create Hash Table: N=66
INSERT: table 07ffb58c, filled 1/67 rv 07eb5264 ==> name="baudrate" value="115200"
INSERT: free(data = 07eb5008)
INSERT: done
In:    serial
Out:   serial
Err:   serial
Net:   No ethernet found.
Raspberry-Pi #

Input doesn’t work yet though.



3 responses to U-Boot for Raspberry Pi, step 2

  1. Wow, booting into single user just after one week of fun! Amazing! Keep up the good work!

  2. Aleksandr Rybalko June 11, 2012 at 3:47 am

    UBoot have multiuser? :)

  3. I just finished the baby step, and trying to boot into the raspberry pi based on the built u-boot.

    “So after tweaking .text offset for u-boot and generating proper image using this tool I finally got:”
    What is the exact command you are using to run “first32k.bin” ?
    For example, I’m still under my hosting Ubuntu 12.04, and I’ve already copied all files mentioned in “baby step” to the mounted driver /media/rpi, say:
    $ ls /media/rpi
    bootcode.bin cmdline.txt kernel.img loader.bin start.elf

    Now, what are the exact process to mkimage for rpi, using the so-called “tools”?

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