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53c27e155b
usbdev_register() calls CLASS_BIND, which ends with DEV_CONNECT (composite_bind/cdcacm_bind) and sets SIE_CTRL.PULLUP_EN, and then performs a wholesale putreg32 of SIE_CTRL to set EP0_INT_1BUF -- clobbering the pull-up microseconds after it was asserted. Enumeration only ever succeeded because the host happened to latch the microsecond pull-up blip and issued a bus reset, whose handler (CLASS_DISCONNECT -> DEV_CONNECT) re-arms the pull-up. A warm host port catches the blip; a cold-plugged port is still in attach debounce, misses it, and never resets -- PULLUP_EN stays 0 forever and the device is totally silent on the bus while NuttX runs normally underneath. This presented as an intermittent, image-dependent "cold boot brick" (boot timing shifts the blip in or out of the host's blind window). Fix: set EP0_INT_1BUF with setbits_reg32 so PULLUP_EN survives. Validated on RP2350 silicon (Raspberry Pi Pico 2 W): an image that failed 0/10 cold plugs enumerated 10/10 with the fix; a second board that had never enumerated at all was recovered by it. The rp2040 driver has the identical code and receives the identical fix (build-tested; the RP2350 validation exercised the shared logic). Fixes apache/nuttx#19434 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Signed-off-by: Ricard Rosson <ricard@groundbits.com> |
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| CMakeLists.txt | ||
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