Automotive Ethernet PHY bring-up: lessons learned and debug tips

" summary

Covers practical steps for bringing up Gigabit Automotive Ethernet PHYs on an i.MX8, including a checklist of required PHY and schematic information, step-by-step software integration for Linux and U-Boot (with common pitfalls to avoid), and hardware/software debugging tips learned from real-world Valeo training and resulting patches intended for upstream U-Boot and Linux.

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