Application loading not working with libdfx

Start with the modified demo application's calls to dfx_cfg_init, dfx_cfg_load, and dfx_cfg_destroy, then compare the library's behavior with fpgautil on the Kv260/PetaLinux setup. Reproduce the hang with devmem 0xa0000000 and the repeated-load overlay error using /media/dfx-static; done means the static overlay can be loaded safely, the SysInfo register is accessible, and a second load has defined behavior.

Hi,

I'm trying to use this library to create an application to load different bitstreams, but I can't make it work! The hardware project I'm using has a reconfigurable partition with two reconfigurable modules. I'm using Kv260 and petalinux. I have tested this application with real hardware, and I used the fpgautil to load and remove the application, and it works well with it.

I modified the demo application to start loading only the static region of the PL, and it looks like this:

#include <stdio.h>
#include "libdfx.h"

int main()
{
	int  package_id_full,ret;

    	package_id_full = dfx_cfg_init("/media/dfx-static", 0, DFX_EXTERNAL_CONFIG_EN);
    	if (package_id_full < 0) return -1;
	printf("dfx_cfg_init: FULL Package completed successfully\r\n");
	
	ret = dfx_cfg_load(package_id_full);
	printf("dfx_cfg_load: FULL Package completed successfully\r\n");

        ret = dfx_cfg_destroy(package_id_full);
        if (ret) return -1;
	printf("dfx_cfg_destroy: FULL Package completed successfully\r\n");
	return 0;
}	

under the folder /media/dfx-static I have the following:

xilinx-kv260-starterkit-20232:/home/petalinux# ls /media/dfx-static/
dfx-static.bit.bin  dfx-static_i.dtbo

The static bitstream has an AXI slave called SysInfo that I want to access.
In the console, I see the following:

xilinx-kv260-starterkit-20232:/home/petalinux# Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /fpga-full/firmware-name
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /fpga-full/pid
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /fpga-full/resets
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /fpga-full/uid
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/fpga_PR0
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/afi0
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/clocking0
Dec 22 07:10:33 xilinx-kv260-starterkit-20232 kernel: OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/SysInfo_0

xilinx-kv260-starterkit-20232:/home/petalinux#

I see the device I want to read (/symbols/SysInfo_0) was loaded correctly, but when I try to read the register like this:

xilinx-kv260-starterkit-20232:/home/petalinux# devmem 0xa0000000

• 1rst problem - This board just hangs, and I have to manually reset it.
• 2nd problem - when I try to load the application twice, I get this error:

xilinx-kv260-starterkit-20232:~$ Dec 22 07:26:50 xilinx-kv260-starterkit-20232 kernel: fpga_region region0: Region already has overlay applied.
Dec 22 07:26:50 xilinx-kv260-starterkit-20232 kernel: OF: overlay: overlay changeset pre-apply notifier error -22, target: /fpga-full
Dec 22 07:26:50 xilinx-kv260-starterkit-20232 kernel: create_overlay: Failed to create overlay (err=-22)

Shouldn't the library verify if the same overlay is already applied and remove it before applying a new one?

I removed the overlay that is loaded by default by removing the overlay, with rmdir

xilinx-kv260-starterkit-20232:/home/petalinux# rmdir /configfs/device-tree/overlays/k26-starter-kits_image_1/

Then it loads I still have the 1rst problem.
So my question is what is the difference between using fpgautil and this library?

Thanks in advance for any support provided with this issue.