Re: [Discuss-gnuradio] Booting Zynq/Gnuradio

[Philip Balister]

On 08/20/2013 04:32 AM, Jan Schiefer wrote:
> Hi everybody,
> 
> I was thrilled to find Jonathon's writeup, and I have been trying to get
> the same setup working here. Some things I learned along the way:
> 
> - OpenEmbedded is very very cool!
> - bitbake doesn't work on eCryptfs file systems, as its path length
> restrictions are not acceptable. One needs to build somewhere else (or at
> least put the TMP and SSTATE-CACHE directories elsewhere).
> - On my system (Ubuntu 12.04 64-bit), there was no binary called gmake,
> which caused problems when generating the bit file with the Xilinx tool
> chain. Solved this by linking /usr/bin/make to /usr/bin/gmake
> 
> Now, many many CPU cycles later, I am at the point of booting it. Well,
> almost. What happens is that Das U-Boot is looking for an initial ramdisk:
> 
> U-Boot 2013.01 (Aug 17 2013 - 06:32:40)
> 
> DRAM:  512 MiB
> WARNING: Caches not enabled
> MMC:   zynq_sdhci: 0
> SF: Detected S25FL256S with page size 64 KiB, total 32 MiB
> In:    serial
> Out:   serial
> Err:   serial
> Net:   Gem.e000b000
> Hit any key to stop autoboot:  0
> Copying Linux from SD to RAM...
> Device: zynq_sdhci
> Manufacturer ID: 1b
> OEM: 534d
> Name: 00000
> Tran Speed: 50000000
> Rd Block Len: 512
> SD version 2.0
> High Capacity: Yes
> Capacity: 3.7 GiB
> Bus Width: 4-bit
> reading uImage
> 2855496 bytes read in 415 ms (6.6 MiB/s)
> reading devicetree.dtb
> 21734 bytes read in 19 ms (1.1 MiB/s)
> reading uramdisk.image.gz
> ** Unable to read file uramdisk.image.gz **
> zynq-uboot>
> 
> Why? Because the environment says so:
> sdboot=echo Copying Linux from SD to RAM... && mmcinfo && fatload mmc 0
> 0x3000000 ${kernel_image} && fatload mmc 0 0x2A00000 ${devicetree_image}
> && fatload mmc 0 0x2000000 ${ramdisk_image} && bootm 0x3000000 - 0x2A00000
> 
> That doesn't seem quite right, I am assuming this should use the rootfs in
> the rootfs partition, shouldn't it?
> 
> So my question is, am I missing something, or is the zynq Wiki page
> missing a little section on how to set up the U-Boot environment variables
> in the flash?

I assume you figured out you need to modify the bootm command so it does
not look for the ramdisk?  The default config from Xilinx is somewhat
obsessed with booting from a ramdisk :) I'm looking into some ways of
modifying the bootloader behavior without rebuilding it all the time.

What zynq hardware are you using?

Philip

> 
> Again, thanks for the great work, this is exciting stuff!
> 
> Regards,
>    Jan, ac7td
> 
> 
> 
> 
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