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Software Application Development picoZed boot
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picoZed boot

lguser
lguser over 6 years ago

Just recently I started working on the picoZed 7015 SOM board.  I have a few basic questions on boot. For prototyping and debugging, is it possible that we activate both SD (sdhci) controllers at the same time (one for SD and the other eMMC) ?  (In production we will use eMMC only.)  

While awaiting hardware to generate the HDF file, is there a sample HDF file for this board so I can build the FSBL?

In the meantime, I loaded Xilinx U-boot (2017) on the picoZed.  Expectedly, the boot failed with no output. This U-boot image uses SPL as the FSBL and it was built for the picoZed via the following commands (without the proper ps7_init_gpl.c from HDF) :

  make zynq_picozed_defconfig; make

I had a Xilinx ZC702 board. So I loaded the ZC702 U-boot (built with zynq_zc702_defconfig) on this picoZed board. Surprisingly it went further and it was searching for the U-boot proper image (u-boot.img), 

  spl: error reading image u-boot.img

Am I missing anything?  Will zynq_picozed_defconfig work if I provide the proper ps7_init_gpl.c file?  

If SPL is not used in U-boot, is there anything we need to supply U-boot for picoZed?

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  • lguser
    0 lguser over 6 years ago

    Hi Byran, thanks for the info.  Is the sdhci controller for the eMMC by default configured and enabled by the FSBL?  By the way, is the eMMC/JX2 MIO multiplexer automatically configured to select eMMC?  Do we need to modify the device-tree (u-boot/Linux) to turn it on?    Thanks.

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  • lguser
    0 lguser over 6 years ago

    Hi Byran, thanks for the info.  Is the sdhci controller for the eMMC by default configured and enabled by the FSBL?  By the way, is the eMMC/JX2 MIO multiplexer automatically configured to select eMMC?  Do we need to modify the device-tree (u-boot/Linux) to turn it on?    Thanks.

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  • bhfletcher
    0 bhfletcher over 6 years ago in reply to lguser

    The PicoZed eMMC is enabled by default in the standard board definition, so if you use that, then yes, the FSBL will configure and enable the eMMC. On Rev C and prior, the eMMC/JX2 MIO muliplexer is configured to automatically select eMMC. On Rev E, the multiplexer has been removed, and the resistor jumpers that replaced the mux are configured for eMMC by default.

    Bryan

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