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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>
83 lines
2.4 KiB
Text
83 lines
2.4 KiB
Text
# SPDX-License-Identifier: GPL-2.0+
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#
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# Xilinx ZYNQ U-Boot
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#
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# (C) Copyright 2013 Xilinx, Inc.
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1. About this
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This document describes the information about Xilinx Zynq U-Boot -
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like supported boards, ML status and TODO list.
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2. Zynq boards
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Xilinx Zynq-7000 All Programmable SoCs enable extensive system level
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differentiation, integration, and flexibility through hardware, software,
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and I/O programmability.
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* zc702 (single qspi, gem0, mmc) [1]
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* zc706 (dual parallel qspi, gem0, mmc) [2]
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* zed (single qspi, gem0, mmc) [3]
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* microzed (single qspi, gem0, mmc) [4]
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* zc770
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- zc770-xm010 (single qspi, gem0, mmc)
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- zc770-xm011 (8 or 16 bit nand)
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- zc770-xm012 (nor)
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- zc770-xm013 (dual parallel qspi, gem1)
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3. Building
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ex. configure and build for zc702 board
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$ make zynq_zc702_config
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$ make
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4. Bootmode
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Zynq has a facility to read the bootmode from the slcr bootmode register
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once user is setting through jumpers on the board - see page no:1546 on [5]
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All possible bootmode values are defined in Table 6-2:Boot_Mode MIO Pins
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on [5].
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board_late_init() will read the bootmode values using slcr bootmode register
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at runtime and assign the modeboot variable to specific bootmode string which
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is intern used in autoboot.
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SLCR bootmode register Bit[3:0] values
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#define ZYNQ_BM_NOR 0x02
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#define ZYNQ_BM_SD 0x05
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#define ZYNQ_BM_JTAG 0x0
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"modeboot" variable can assign any of "norboot", "sdboot" or "jtagboot"
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bootmode strings at runtime.
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5. Mainline status
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- Added basic board configurations support.
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- Added zynq u-boot bsp code - arch/arm/cpu/armv7/zynq
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- Added zynq boards named - zc70x, zed, microzed, zc770_xm010/xm011/xm012/xm013
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- Added zynq drivers:
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serial - drivers/serial/serial_zynq.c
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net - drivers/net/zynq_gem.c
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mmc - drivers/mmc/zynq_sdhci.c
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spi - drivers/spi/zynq_spi.c
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qspi - drivers/spi/zynq_qspi.c
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i2c - drivers/i2c/zynq_i2c.c
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nand - drivers/mtd/nand/zynq_nand.c
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- Done proper cleanups on board configurations
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- Added basic FDT support for zynq boards
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- d-cache support for zynq_gem.c
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6. TODO
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- Add FDT support on individual drivers
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[1] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC702-G.htm
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[2] http://www.xilinx.com/products/boards-and-kits/EK-Z7-ZC706-G.htm
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[3] http://zedboard.org/product/zedboard
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[4] http://zedboard.org/product/microzed
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[5] http://www.xilinx.com/support/documentation/user_guides/ug585-Zynq-7000-TRM.pdf
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--
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Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
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Sun Dec 15 14:52:41 IST 2013
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