u-boot/doc/README.bus_vcxk
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

68 lines
1.8 KiB
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SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2008-2009
* BuS Elektronik GmbH & Co. KG <www.bus-elektronik.de>
* Jens Scharsig <esw@bus-elektronik.de>
*/
U-Boot vcxk video controller driver
======================================
By defining CONFIG_VIDEO_VCXK this driver can be used with VC2K, VC4K and
VC8K devices on following boards:
board | ARCH | Vendor
-----------------------------------------------------------------------
EB+CPU5282-T1 | MCF5282 | BuS Elektronik GmbH & Co. KG
EB+MCF-EVB123 | MCF5282 | BuS Elektronik GmbH & Co. KG
EB+CPUx9K2 | AT91RM9200 | BuS Elektronik GmbH & Co. KG
ZLSA | AT91RM9200 | Ruf Telematik AG
Driver configuration
--------------------
The driver needs some defines to describe the target hardware:
CONFIG_SYS_VCXK_BASE
base address of VCxK hardware memory
CONFIG_SYS_VCXK_DEFAULT_LINEALIGN
defines the physical alignment of a pixel row
CONFIG_SYS_VCXK_DOUBLEBUFFERED
some boards that use vcxk prevent read from framebuffer memory.
define this option to enable double buffering (needs 16KiB RAM)
CONFIG_SYS_VCXK_<xxxx>_PIN
defines the number of the I/O line PIN in the port
valid values for <xxxx> are:
ACKNOWLEDGE
describes the acknowledge line from vcxk hardware
ENABLE
describes the enable line to vcxk hardware
INVERT
describes the invert line to vcxk hardware
RESET
describes the reset line to vcxk hardware
REQUEST
describes the request line to vcxk hardware
CONFIG_SYS_VCXK_<xxxx>_PORT
defines the I/O port which is connected with the line
for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN
CONFIG_SYS_VCXK_<xxxx>_DDR
defines the register which configures the direction
for valid values for <xxxx> see CONFIG_SYS_VCXK_<xxxx>_PIN