Mailbox Interrupt debug 11/11/2016

Transcription

1 Mailbox Interrupt debug 11/11/2016 In this demo I will be using Vivado to create the HW on the ZC702 board and will simulate an interrupt using the mailbox in the PL to drive an interrupt from the PL to the PS. I will test using a UIO driver to handle the interrupt in linux. Code used can be seen here: Step 1: Create the HW: Here, I am using the AXI JTAG to fill the FIFO. My Interrupt config can be seen here. So, I am using a single interrupt (#61) Address Map is seen below:

2 My Mailbox config is seen below: Note: I kept the FIFO depth small for testing purposes. Generate Output Products, Create HDL wrapper, write_bitstream, export to SDK and launch SDK.

3 Step 3: Build Linux Image: Here, we will be using Petalinux source /proj/gsd/petalinux/petalinux-v final/settings.csh petalinux-create --type project --template zynq --name petalinux_test petalinux-config --get-hw-description -p petalinux_test Save and Exit cd petalinux_test petalinux-config -c kernel o Device Drivers <*>Userspace I/O driver <*> Userspace I/O platform driver with generic IRQ handling <*> Userspace platform driver with generic IRQ handling and dynamic memory Save and Exit Open the DeviceTree: o petalinux_test\subsystems\linux\configs\device-tree\system-conf.dtsi o update the bootargs as follows: bootargs = "console=ttyps0, earlyprintk uio_pdrv_genirq.of_id=generic-uio"; o petalinux_test\subsystems\linux\configs\device-tree\system-top.dts &gem0 { phy-handle = <&phy0>; ps7_ethernet_0_mdio: mdio { phy0: phy@7 { compatible = "marvell,88e1116r"; device_type = "ethernet-phy"; reg = <7>; &ocmc { compatible = ""; &mailbox_0 { compatible = "generic-uio"; reg = <0x x xFFFC0000 0x20000>; petalinux-config -c rootfs o Filesystem Packages -> base -> tcf-agent -> <*> tcf-agent o Save and Exit petalinux-build cd images/linux petalinux-package --boot --fsbl zynq_fsbl.elf --fpga design_1_wrapper.bit --uboot

4 Copy the BOOT.BIN and the image.ub onto the SD card, place the SD card into the SD card slot on the ZC702 and set the mode to boot from the SD card and boot. Some verifications: Verify that the tcf-agent has started. Make sure that the UIO is there: ls /dev and verify that the uio0 is there. Verify that the interrupt is detected: cat /proc/interrupts: o 166: 0 0 GIC 61 Level gpio Verify the LAN: ifconfig eth netmask and ping

5 Step 4: Build SDK Linux application: Launch SDK, and File -> Application Project: Right click on the mailbox_interrupt/src and file -> new -> Source File

6 The code I used here is trivial: I set the thresholds: o o mailbox_write(mailbox_ptr, MAILBOX_SIT_OFFSET, MAILBOX_SIT); mailbox_write(mailbox_ptr, MAILBOX_RIT_OFFSET, MAILBOX_RIT); Enable the interrupt for various conditions: // enable the interrupts from the mailbox mailbox_write(mailbox_ptr, MAILBOX_IE_OFFSET, XMB_IX_STA XMB_IX_RTA XMB_IX_ERR); In the handler I read the type of interrupt, print and clear: reg = mailbox_read(mailbox_ptr, MAILBOX_IS_OFFSET); if (reg & XMB_IX_STA) { mailbox_write(mailbox_ptr, MAILBOX_IS_OFFSET, reg); IntrSTACount++; printf("sta interrupt %d\n",intrstacount); write(fd, (void *)&reenable, sizeof(int)); } if (reg & XMB_IX_RTA) { mailbox_write(mailbox_ptr, MAILBOX_IS_OFFSET, reg); IntrRTACount++; printf("rta interrupt %d\n",intrrtacount); write(fd, (void *)&reenable, sizeof(int)); } if (reg & XMB_IX_ERR) { mailbox_write(mailbox_ptr, MAILBOX_IS_OFFSET, reg); IntrERRCount++; printf("err interrupt %d\n",intrerrcount); write(fd, (void *)&reenable, sizeof(int)); }

7 Setup the Linux TCF Agent by dropping down the Linux TCF Agent, and right clicking on the Linux Agent (default) and Edit: Set the Host the same as the board IP address set in the last step: Use the Test Connection to test that the SDK can connect to tcf-agent running on the board. Note: you may need to disable any firewalls on your local machine. Right click on the mailbox_interrupt application in Project Explorer in SDK and select Debug As -> Debug Configurations. Double click on the Xilinx C/C++ application (System Debugger). In the Target Setup tab, set the Debug Type to Linux Application:

8 In the application tab, setup as follows: Apply and debug. This will open the Debug perspective. User can steps through the code if they which, or just resume. There is a while loop in the code that will just sit and wait for interrupts. In the mean time, open the HW_MANAGER from Vivado and connect to the target. Here, I am using the command below ot write ot the mailbox: create_hw_axi_txn wr_txn [get_hw_axis hw_axi_1] -address data { _ _ _ _ _ _ _ } - len 8 -size 32 -type write run_hw_axi wr_txn This will write 8 words to the FIFO. We can verify, this by reading the data. Reading from the RDATA will pop one value from the FIFO: xsdb% mrd -force 0x :

9 Fill the FIFO: I can see the interrupt triggering: