[yocto] Using uboot to boot a large uimage

[Crast, Nicholas]

Here is what I am seeing with core-image-minimal

32612024 bytes read in 11244 ms (2.8 MiB/s)
18179 bytes read in 30 ms (590.8 KiB/s)
## Booting kernel from Legacy Image at 00100000 ...
   Image Name:   Linux-3.12.0
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    32611960 Bytes = 31.1 MiB
   Load Address: 00008000
   Entry Point:  00008000
## Flattened Device Tree blob at 00000100
   Booting using the fdt blob at 0x00000100
   Loading Kernel Image ... OK
OK
   Loading Device Tree to 03ff8000, end 03fff702 ... OK

Starting kernel ...


If I make the uBoot image ~3 MB just using core-image-minimal-initramfs, I get different results. Here are the relevant part of my uboot configuration:


fdtaddr=0x00000100
fdtimage=/boot/socfpga_mitysom5csx.dtb
fdtimagesize=0x2000
mmcboot=setenv bootargs console=ttyS0,115200 root=${mmcroot} rw rootwait;bootm ${loadaddr} - ${fdtaddr}
mmcload=mmc rescan;${mmcloadcmd} mmc 0:${mmcloadpart} ${loadaddr} ${bootimage};${mmcloadcmd} mmc 0:${mmcloadpart} ${fdtaddr} ${fdtimage}
mmcloadcmd=ext2load
mmcloadpart=2
mmcroot=/dev/mmcblk0p2

----------------------------------------
Nick Crast
Associate Software Engineer
Saab Sensis Corporation
Phone: 315-445-5703
Email: Nicholas.Crast at saabsensis.com


-----Original Message-----
From: Khem Raj [mailto:raj.khem at gmail.com] 
Sent: Tuesday, August 26, 2014 4:01 PM
To: Crast, Nicholas
Cc: yocto at yoctoproject.org
Subject: Re: [yocto] Using uboot to boot a large uimage

On 14-08-26 18:41:22, Crast, Nicholas wrote:
> I am currently attempting to boot with an initramfs built into my uimage using uboot. 
> 
> However, I cannot get it to boot correctly. If I make the uimage totally bare-bones, and just use core-image-minimal-initramfs, then it hangs huring init at the waiting for devices... printout. Going and gutting the init script, I can get to single user mode and it looks like the filesystem is there.
> 
> I want a more full system, so I included core-image-boot and core-image-basic. I figured this would initialize better. When I do this, my uImage jumps up to ~50MB. U-boot then hangs at "starting kernel..."
> 

core-image-minimal should boot you into shell console. That should have been enough

> I don't think that the uimage is clobbering the device tree, because the device tree is loaded at 0x100, and the uimage is loaded at 0x8000. 
> 

make sure that memory is not overlapping and is initiaized

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