petalinux本身是yocto，xilinx的部分位于：components/yocto/layers/meta-xilinx
$ ls -1 components/yocto/layers/meta-xilinx
meta-microblaze
meta-xilinx-bsp
meta-xilinx-contrib
meta-xilinx-core
meta-xilinx-standalone
meta-xilinx-vendor
meta-xilinx的github仓库为：https://github.com/Xilinx/meta-xilinx
其中 fsbl 和 pmufw位于：meta-xilinx-standalone/recipes-bsp/embeddedsw/
$ ls -1 meta-xilinx-standalone/recipes-bsp/embeddedsw/
embeddedsw
fsbl.bbappend
fsbl-firmware_2023.1.bb
fsbl-firmware_2023.2.bb
fsbl-firmware_git.bb
fsbl-firmware.inc
fsbl-fw-cfg.inc
plm-firmware_2023.1.bb
plm-firmware_2023.2.bb
plm-firmware_git.bb
plm-firmware.inc
plmfw.bbappend
pmu-firmware_2023.1.bb
pmu-firmware_2023.2.bb
pmu-firmware_git.bb
pmu-firmware.inc
pmufw.bbappend
psm-firmware_2023.1.bb
psm-firmware_2023.2.bb
psm-firmware_git.bb
psm-firmware.inc
psmfw.bbappend
versal-fw-cfg.inc
zynqmp-pmufw-cfg.inc
上面是yocto层的描述代码。具体的源码是：embddedsw仓库，地址：https://github.com/Xilinx/embeddedsw.git
查找编译产物：
$ find . -name fsbl*.elf
./build/tmp/deploy/images/zynqmp-generic-xczu2cg/fsbl-zynqmp-generic-xczu2cg--2023.2+gitAUTOINC+c9a0ee31b2-r0-zynqmp-generic-xczu2cg-20231106154503.elf
./build/tmp/deploy/images/zynqmp-generic-xczu2cg/fsbl-zynqmp-generic-xczu2cg.elf
./build/tmp/work/zynqmp_generic_xczu2cg-xilinx-linux/linux-xlnx/6.1.30-xilinx-v2023.2+git999-r0/recipe-sysroot/boot/fsbl.elf
./build/tmp/sysroots-components/zynqmp_generic_xczu2cg/fsbl/boot/fsbl.elf
可以看到一个类似git commid id c9a0ee31b2，在embeddedsw的git克隆目录，可以看到这个commit
$ git log c9a0ee31b2
commit c9a0ee31b2a14cbcfcb56ca369037319b4ad4847 (tag: xilinx_v2023.2)
Author: Nicole Baze <nicole.baze@xilinx.com>
Date: Wed Oct 11 16:28:10 2023 -1200
xilpm: versal: server: Remove XRAM axi-lite clock selection
Currently tools doesn't support enabling XRAM AXILITE interface so remove
XRAM_APB_CLK configuration which selects AXILITE PL source.
Signed-off-by: Nicole Baze <nicole.baze@xilinx.com>
Acked-by: Arun Kannan <arunbala@amd.com>
因此基本可以确定，编译是这么来的。但是具体怎么对应上配置xczu2cg的，就不是很清楚，需要研究下yocto。
类似的bl31.elf，也就是arm-trusted-firmware位于：
components/yocto/layers/meta-xilinx/meta-xilinx-core/recipes-bsp/arm-trusted-firmware/
对应的源码github仓库：git://github.com/Xilinx/arm-trusted-firmware.git