USB/OHCI: endianness cleanup in the generic ohci driver
diff --git a/doc/README.generic_usb_ohci b/doc/README.generic_usb_ohci
index 017c69a..c343dfd 100644
--- a/doc/README.generic_usb_ohci
+++ b/doc/README.generic_usb_ohci
@@ -9,35 +9,52 @@
Configuration options
----------------------
-CONFIG_USB_OHCI_NEW: enable the new OHCI driver
+ CONFIG_USB_OHCI_NEW: enable the new OHCI driver
-CFG_USB_OHCI_BOARD_INIT: call the board dependant hooks:
+ CFG_USB_OHCI_BOARD_INIT: call the board dependant hooks:
- - extern int usb_board_init(void);
- - extern int usb_board_stop(void);
- - extern int usb_cpu_init_fail(void);
+ - extern int usb_board_init(void);
+ - extern int usb_board_stop(void);
+ - extern int usb_cpu_init_fail(void);
-CFG_USB_OHCI_CPU_INIT: call the cpu dependant hooks:
+ CFG_USB_OHCI_CPU_INIT: call the cpu dependant hooks:
- - extern int usb_cpu_init(void);
- - extern int usb_cpu_stop(void);
- - extern int usb_cpu_init_fail(void);
+ - extern int usb_cpu_init(void);
+ - extern int usb_cpu_stop(void);
+ - extern int usb_cpu_init_fail(void);
-CFG_USB_OHCI_REGS_BASE: defines the base address of the OHCI registers
+ CFG_USB_OHCI_REGS_BASE: defines the base address of the OHCI
+ registers
-CFG_USB_OHCI_SLOT_NAME: slot name
+ CFG_USB_OHCI_SLOT_NAME: slot name
-CFG_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the root hub.
+ CFG_USB_OHCI_MAX_ROOT_PORTS: maximal number of ports of the
+ root hub.
Endianness issues
------------------
-The LITTLEENDIAN #define determines if the 'swap_16' and 'swap_32'
-macros do byte swapping or not. But some cpus OHCI-controllers such as
-ppc4xx and mpc5xxx operate in little endian mode, so some extra ifdefs
-were necessary to make this work.
+The USB bus operates in little endian, but unfortunately there are
+OHCI controllers that operate in big endian such as ppc4xx and
+mpc5xxx. For these the config option
+
+ CFG_OHCI_BE_CONTROLLER
+
+needs to be defined.
+
+
+PCI Controllers
+----------------
+
+You'll need to define
+
+ CONFIG_PCI_OHCI
+
+PCI Controllers need to do byte swapping on register accesses, so they
+should to define:
+ CFG_OHCI_SWAP_REG_ACCESS