doc/README.bus_vcxk

   1 /*
   2  * (C) Copyright 2008-2009
   3  * BuS Elektronik GmbH & Co. KG <www.bus-elektronik.de>
   4  * Jens Scharsig <esw@bus-elektronik.de>
   5  *
   6  * See file CREDITS for list of people who contributed to this
   7  * project.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 U-Boot vcxk video controller driver
  26 ======================================
  27
  28 By defining CONFIG_VIDEO_VCXK this driver can be used with VC2K, VC4K and
  29 VC8K devices on following boards:
  30
  31 board           | ARCH          | Vendor
  32 -----------------------------------------------------------------------
  33 EB+CPU5282-T1   | MCF5282       | BuS Elektronik GmbH & Co. KG
  34 EB+MCF-EVB123   | MCF5282       | BuS Elektronik GmbH & Co. KG
  35 EB+CPUx9K2      | AT91RM9200    | BuS Elektronik GmbH & Co. KG
  36 ZLSA            | AT91RM9200    | Ruf Telematik AG
  37
  38 Driver configuration
  39 --------------------
  40
  41 The driver needs some defines to describe the target hardware:
  42
  43 CONFIG_SYS_VCXK_BASE
  44
  45         base address of VCxK hardware memory
  46
  47 CONFIG_SYS_VCXK_DEFAULT_LINEALIGN
  48
  49         defines the physical alignment of a pixel row
  50
  51 CONFIG_SYS_VCXK_DOUBLEBUFFERED
  52
  53         some boards that use vcxk prevent read from framebuffer memory.
  54         define this option to enable double buffering (needs 16KiB RAM)
  55
  56 CONFIG_SYS_VCXK_<xxxx>_PIN
  57
  58         defines the number of the I/O line PIN in the port
  59         valid values for <xxxx> are:
  60
  61                 ACKNOWLEDGE
  62                         describes the acknowledge line from vcxk hardware
  63
  64                 ENABLE
  65                         describes the enable line to vcxk hardware
  66
  67                 INVERT
  68                         describes the invert line to vcxk hardware
  69
  70                 RESET
  71                         describes the reset line to vcxk hardware
  72
  73                 REQUEST
  74                         describes the request line to vcxk hardware
  75
  76 CONFIG_SYS_VCXK_<xxxx>_PORT
  77
  78         defines the I/O port which is connected with the line
  79         for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN
  80
  81 CONFIG_SYS_VCXK_<xxxx>_DDR
  82
  83         defines the register which configures the direction
  84         for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN