[meta-xilinx] Ultra96 UART

Wed Oct 3 01:19:07 PDT 2018

Hi Tom

Thanks for the extra information. I was able to regenerate the HDF with (I think) the appropriate changes in the PSU UART configuration (just changing UART1 to MIO[0..1], is that all that is required?). I then (eventually) managed to get everything to build in Yocto using the new HDF by setting the HDF_PATH appropriately in my local.conf.

With the new boot.bin etc. I see the FSBL output now (a step forward) but nothing more - I guess U-Boot is not loading properly from the boot.bin? 

I am slightly confused as to why this is necessary. Manju from Xilinx said they have verified that it works but you are saying that the HDF provided by default in meta-xilinx* is incorrect - have I missed something?

Thanks in advance
Simon

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Date: Fri, 28 Sep 2018 21:24:27 +0000
From: "Curran, Tom (EM)" <Tom.Curran at Avnet.com>
To: "meta-xilinx at lists.yoctoproject.org"
<meta-xilinx at lists.yoctoproject.org>
Subject: Re: [meta-xilinx] Ultra96 UART
Message-ID:
<0434C4D44760FB40AAFB554C7C241CAF107960EB at CMX039USMB.AVNET.COM>
Content-Type: text/plain; charset="utf-8"

Yes, the user STDIN/STDOUT UART is psu_uart_1 in the image that gets built via meta-xilinx, etc., BUT the UART is mapped out through EMIO to the low speed expansion header:

#HD_GPIO_5 on FPGA / Connector pin 13 / UART1_rxd
set_property PACKAGE_PIN G5 [get_ports UART1_rxd]
#HD_GPIO_4 on FPGA / Connector pin 11 / UART1_txd
set_property PACKAGE_PIN F6 [get_ports UART1_txd]

You can get a look at the hardware platform by installing the posted PetaLinux BSP for the Ultra96 board:
https://www.xilinx.com/member/forms/download/xef.html?filename=xilinx-ultra96-reva-v2018.2-final.bsp

See Xilinx UG1144 for the BSP install instructions:
http://www.xilinx.com/support/documentation/sw_manuals/xilinx2018_2/ug1144-petalinux-tools-reference-guide.pdf

To use the Avnet USB UART/JTAG adapter the UART needs to be changed from EMIO to MIO[0:1] in the PSU config of the Vivado design.  Then it should be possible to regenerate the hdf file and drop it in the correct folder and run a new bitbake build.

--Tom

From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Manjukumar Harthikote Matha
Sent: Wednesday, September 26, 2018 11:17 AM
To: Tomas Thoresen <tomast at xilinx.com>; simon.goda at doulos.com; meta-xilinx at lists.yoctoproject.org
Subject: Re: [meta-xilinx] Ultra96 UART

Hi,

Yes it should be psu_uart_1. Please use rel-v2018.3 branches from github.com/xilinx tree, we have verified and it works.
https://github.com/Xilinx/meta-xilinx-tools/blob/rel-v2018.2/classes/xsctyaml.bbclass#L15-L16

You can use repo command to get the release branches
http://www.wiki.xilinx.com/How%20to%20build%20images%20through%20yocto

Thanks,
Manju

From: meta-xilinx-bounces at yoctoproject.org<mailto:meta-xilinx-bounces at yoctoproject.org> [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of Tomas Thoresen
Sent: Wednesday, September 26, 2018 2:04 AM
To: simon.goda at doulos.com<mailto:simon.goda at doulos.com>; meta-xilinx at lists.yoctoproject.org<mailto:meta-xilinx at lists.yoctoproject.org>
Subject: Re: [meta-xilinx] Ultra96 UART

Hi Simon,

If I?m not mistaking, I believe it uses uart1 instead of uart0...

So, something like this:

YAML_BSP_CONFIG[stdin]="set,psu_uart_1"
YAML_BSP_CONFIG[stdout]="set,psu_uart_1"

Hope this helps.

Cheers,

Tomas

From: meta-xilinx-bounces at yoctoproject.org<mailto:meta-xilinx-bounces at yoctoproject.org> [mailto:meta-xilinx-bounces at yoctoproject.org] On Behalf Of simon.goda at doulos.com<mailto:simon.goda at doulos.com>
Sent: 26 September 2018 09:48
To: meta-xilinx at lists.yoctoproject.org<mailto:meta-xilinx at lists.yoctoproject.org>
Subject: [meta-xilinx] Ultra96 UART

Hi

I am trying to get a meta-xilinx/meta-xilinx-tools build (using versions Rocko & rel-v2018.2) to boot on an Ultra96 board. Following the various bits of guidance from this list I have successfully built, and have all the files I would expect in tmp/deploy/images/.

The files do not seem to boot - or at least I don't see anything on the serial (via the Avnet serial to USB dongle for the Ultra96).

I have read on another forum (http://zedboard.org/content/j6-serial-port-appears-not-be-working) that the default config of the FSBL for the Ultra96 board does not configure the UART properly and indeed using a 'hacked' boot.bin which has been 'fixed' from that forum entry I can boot the board and see output on the UART.

My questions are:

- Has anyone else successfully booted an Ultra96 using meta-xilinx/meta-xilinx-tools?
- If so, did you see anything on the UART? Were any changes made to the FSBL configuration to achieve this?

Any comments or guidance gratefully received!

Thanks & regards
Simon Goda

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