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- EP0 OUT: park a back-to-back data-stage packet the DCP accepted before PID could go NAK and deliver it into the next armed chunk; flow-control the single-buffer control pipe between chunks (usbtest ctrl_out corruption); discard a packet parked while an OUT pipe was halted so BOT reset recovery's fresh CBW read can't receive stale WRITE data - HS UTMI PHY power-up per the FSP sequence, shared by dcd/hcd: CLKSEL programmed from the board XTAL (EK-RA8M1 runs 20 MHz; the 24 MHz reset default never locks) while DIRPD holds the PHY down, then timed release - hw/bsp(ra8m1_ek): fix U60CK divider macro - BSP_CFG_U60CK_DIV used the generic USB_CLOCK_DIV_8 encoding (7), which USB60CKDIVCR rejects, leaving the USBHS link domain at 480 MHz; the USB60-specific BSP_CLOCKS_USB60_CLOCK_DIV_8 (4) sticks and yields the required 60 MHz from PLL1P - support FS-only builds on the high-speed port: gate SYSCFG.HSE on TUD_OPT_HIGH_SPEED (RHPORT_DEVICE_SPEED=OPT_MODE_FULL_SPEED was a silent no-op) and always compile both hwfifo access widths - the FIFO width belongs to the module, not the link speed (FS builds corrupted odd-length tails: 16-bit access against MBW-32) - iso activate: reset stale pipe bookkeeping so a BRDY firing before the class re-arms can't replay a pre-SET_INTERFACE transfer; write PIPEBUF after PIPESEL selects the pipe (PIPESEL-windowed register) - clear-halt: re-assert BUF on a still-armed OUT pipe (usbtest case 29) - bound the D0FIFO ready spin so an undrained double-buffered IN pipe can't freeze the stack with the IRQ masked - usbtest example: cap interrupt mps at 64 on RUSB2 high speed (pipes 6-9 have a fixed 64-byte buffer, RA6M5 UM 29.1) Verified: usbtest 30/30 on ra6m5_ek (HS), ra4m1_ek (FS) and ra8m1_ek (FS-forced build on the HS port). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01HeF2gZ1M7GWkz6Av4BpKPg