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Mainline TF-A doesn't initialize SGRF_SOC_CON8-CON15 which control DMAC0 and DMAC1 configuration. Without this, the PL330 DMA controllers cannot be accessed from Linux and PERIPH_ID reads as 0x0. The fix configures SGRF registers to set DMAC manager threads to running state and non-secure mode, then pulses DMAC reset to apply the new configuration. Based on community reverse-engineering: - https://lists.denx.de/pipermail/u-boot/2023-April/514267.html - https://gist.github.com/CrystalGamma/a68333fa4c9fda7eb6c09d30ad4937fe Tested on Helios64 (RK3399). Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>