Хост-контроллер USB2.0: список регистров

  Unused

  CAPLENGTH

The value in these bits indicates an offset to add to register base to find the beginning of the Operational Register Space.

Команда U-Boot для чтения регистра

Bit fields structure

typedef union  e_caplength
{
  struct
  {
   unsigned caplength : 8;
   unsigned unused0 : 24;
  } b;
   unsigned long w;
} E_CAPLENGTH