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diff --git a/user/bsps/arm/xilinx-zynqmp-rpu.rst b/user/bsps/arm/xilinx-zynqmp-rpu.rst new file mode 100644 index 0000000..0dfb77e --- /dev/null +++ b/user/bsps/arm/xilinx-zynqmp-rpu.rst @@ -0,0 +1,95 @@ +.. SPDX-License-Identifier: CC-BY-SA-4.0 + +.. Copyright (C) 2024 On-Line Applications Research Corporation (OAR) + +.. _BSP_arm_xilinx_zynqmp_rpu: + +Xilinx ZynqMP RPU +================= + +This BSP supports the Cortex-R5 processor on the Xilinx Zynq UltraScale+ MPSoC +platform. Basic hardware initialization is performed by the Cortex-R5 FSBL and +the BSP. This BSP supports the GICv2 interrupt controller available to the +Cortex-R5 subsystem. Since the Cortex-R5 subsystem only varies in speed, this +BSP should be functional across all chip variants as well as on Xilinx's QEMU +branch. SMP operation is not currently supported. + +Clock Driver +------------ + +The clock driver uses one of the available triple timer counters (TTCs) as the +timer interrupt source. + +Console Driver +-------------- + +The console driver supports the default Qemu emulated ARM PL011 PrimeCell UART +as well as the physical ARM PL011 PrimeCell UART in the ZynqMP hardware. + +Boot on ZynqMP Hardware +----------------------- + +On the ZynqMP RPU, RTEMS can be started by Cortes-R5 u-boot, Cortex-A53 u-boot, +via JTAG, or directly as part of BOOT.bin. For quick turnaround during testing, +it is recommended to use Cortex-A53 u-boot to avoid repeated BOOT.bin +generation since the provided Cortex-R5 u-boot is highly limited and has no +network or MMC/SD access. + +Note that if the RPU image is started by the Cortex-A53 u-boot, the program +sections located at ZYNQMP_RPU_RAM_INT_0_ORIGIN and ZYNQMP_RPU_RAM_INT_1_ORIGIN +must be manually relocated from DDR to TCM since the TCMs are not directly +available to the Cortex-A53 cores at their Cortex-R5 internal addresses. This +can be accomplished by disabling dcache in u-boot and using u-boot's "cp" +command. Once this is done, the program can be started at 0x0 by using u-boot's +"cpu" command to first disable core 4 and then release it in split mode. + +Hardware Boot Image Generation +------------------------------ + +When generating BOOT.bin from components, the BIF file should include at least +entries for the Cortex-R5 FSBL ([bootloader,destination_cpu=r5-0]) and the +Cortex-R5 application ([destination_cpu=r5-0]). The Cortex-R5 application should +be either a u-boot or RTEMS ELF binary. The Cortex-R5 u-boot binary can be +obtained by building it from Xilinx's u-boot repository. The Cortex-R5 FSBL can +be obtained setting up an appropriate platform project in Xilinx's current +development system. + +Boot on QEMU +------------ +The executable image is booted by Qemu in ELF format. + +Running Executables on QEMU +--------------------------- + +Xilinx's qemu-devicetrees repository must be used in conjunction with the Xilinx +QEMU available via RSB. Executables generated by this BSP can be run using the +following command: + +.. code-block:: shell + + qemu-system-aarch64 -no-reboot -nographic -M arm-generic-fdt -serial null \ + -serial mon:stdio -device loader,file=example.exe,cpu-num=4 \ + -device loader,addr=0xff5e023c,data=0x80088fde,data-len=4 \ + -device loader,addr=0xff9a0000,data=0x80000218,data-len=4 \ + -hw-dtb /xlnx-qemu-devtrees-path/LATEST/SINGLE_ARCH/board-zynqmp-zcu102.dtb \ + -m 4096 -display none + +Debugging Executables on QEMU +----------------------------- + +Debugging the RPU cores under QEMU presents unique challenges due to requiring +the AArch64 QEMU to emulate the entire processing subsystem. Debugging requires +a multi-arch GDB which can be created by adding "--enable-targets=all" to the +normal GDB configure line and then building as normal. + +To attach to the RPU core once QEMU is started with "-s -S", The following steps +are required: + +.. code-block:: shell + + aarch64-rtems6-gdb + (gdb) tar ext :1234 + (gdb) add-inferior + (gdb) inferior 2 + (gdb) file example.exe + (gdb) attach 2 |