I have found SATA always link down issue when kernel is up with petalinux 2021.1 and there is no problem with petalinux 2020.2.
Here are two boot log. How do I fix this issue?
In U-boot, sata works fine
There are difference between 2020.2 device tree and 2021.1 device tree. I have referred the link sata_device_tree and modify my sata reference clock to 150 MHz. Now, sata works fine.
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