[FPGA开发] 诚心求大侠解惑，关于uboot、preloader、dtb

linux小白一个，手头有一块arrow sockit的FPGA板子，有些问题一直没有搞明白，拜求大侠解惑，不胜感激！

1、什么情况下需要更新SD卡中uboot、preloader、dtb？
     比如说在HPS-FPGA桥上新增了一个信号处理的定制外设，是否需要更新uboot、preloader、dtb？

2、uboot、preloader和dtb是不是针对不同的开发板定制的还是针对不同SoC芯片定制的？
     上述三个文件针对terrasic、altera及heli等板子是不是不同的？

3、什么情况下需要编写设备驱动？
     比如在FPGA端通过ADC进行数据采集，然后通过FPGA-HPS桥写入HPS中，这个过程需不需要写驱动程序？
     为什么点亮LED的程序只需要使用内存映射就可以了，而不用写驱动程序？

4、参考相关教程，本文重新编译了preloader，但是一直没有调通，麻烦哪位大侠给看一下！
    （1）软件版本是13.1，操作系统是win7
    （2）Qsys 添加led_pio，点击generate;
    （3）quartus 综合，生成sof和rbf文件；
    （4）bsp-editor新建BSP，生成settings.bsp；
    （5）进入目录spl_bsp, make出u-boot-spl.bin;
    （6）通过 mkpimage -o preloader_with_header.img u-boot-spl.bin生成preloader.img
    （7）在linux下通过dd命令写入SD卡
    （8）putty结果如下：
         

U-Boot 2012.10 (Mar 29 2013 - 12:54:06) CPU   : Altera SOCFPGA Platform BOARD : Altera SOCFPGA Cyclone 5 Board DRAM:  1 GiB MMC:   DESIGNWARE SD/MMC: 0 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 MMC init failed Using default environment In:    serial Out:   serial Err:   serial Net:   mii0 Warning: failed to set MAC address Hit any key to stop autoboot:  0 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ** Bad device mmc 0 ** ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ERROR: dw_pull: stat 0x200 request failed. status: 0x00000200 ** Bad device mmc 0 ** Wrong Image Format for bootm command ERROR: can't get kernel image! SOCFPGA_CYCLONE5 # CPU   : Altera SOCFPGA Platform Unknown command 'CPU' - try 'help' SOCFPGA_CYCLONE5 # BOARD : Altera SOCFPGA Cyclone 5 Board Unknown command 'BOARD' - try 'help' SOCFPGA_CYCLONE5 # DRAM:  1 GiB Unknown command 'DRAM:' - try 'help' SOCFPGA_CYCLONE5 # MMC:   DESIGNWARE SD/MMC: 0 Unknown command 'MMC:' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # MMC init failed Unknown command 'MMC' - try 'help' SOCFPGA_CYCLONE5 # Using default environment Unknown command 'Using' - try 'help' SOCFPGA_CYCLONE5 # Unknown command 'Using' - try 'help' SOCFPGA_CYCLONE5 # In:    serial Unknown command 'In:' - try 'help' SOCFPGA_CYCLONE5 # Out:   serial Unknown command 'Out:' - try 'help' SOCFPGA_CYCLONE5 # Err:   serial Unknown command 'Err:' - try 'help' SOCFPGA_CYCLONE5 # Net:   mii0 Unknown command 'Net:' - try 'help' SOCFPGA_CYCLONE5 # Warning: failed to set MAC address Unknown command 'Warning:' - try 'help' SOCFPGA_CYCLONE5 # Unknown command 'Warning:' - try 'help' SOCFPGA_CYCLONE5 # Hit any key to stop autoboot:  0 Unknown command 'Hit' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ** Bad device mmc 0 ** Unknown command '**' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ERROR: dw_pull: stat 0x200 Unknown command 'ERROR:' - try 'help' SOCFPGA_CYCLONE5 # request failed. status: 0x00000200 Unknown command 'request' - try 'help' SOCFPGA_CYCLONE5 # ** Bad device mmc 0 ** Unknown command '**' - try 'help' SOCFPGA_CYCLONE5 # Wrong Image Format for bootm command Unknown command 'Wrong' - try 'help' SOCFPGA_CYCLONE5 # ERROR: can't get kernel image! > SOCFPGA_CYCLONE5 #

  

拜托拜托了，这段时间快被折腾死了！

不懂帮顶

帮顶

多谢帮顶的朋友们!

我也很想知道这些问题

不懂帮顶，最近准备研究一下楼主说的几个问题，依稀记得去年被这个问题虐的死去活来，后来没办法直接用的官网现成的Linux系统。哎，，，，

我也刚开始弄，很想知道。请陈版主出来解疑答惑吧@chenzhufly

1、uboot、preloader、dtb这些是做什么的你要搞清楚。
     uboot：是引导操作系统的，一般的开发板都已经有编译好了的镜像，不需要改变，就算改变有可能是改变环境变量。
     preloader：是确定最开始启动的，可以把它理解为引导uboot。
     dtb：是linux系统运行后，确定有哪些外设在系统上的，配置文件。
2、肯定不同，同一块板子，你选的启动方式不同，这些也不同。我建议你uboot、preloader用开发板提供的，dtb用自己的。
3、启动方式的不同，这也有些不同；
假设你是hps先 启动，然后用uboot（假设在nand中） 去启动FPGA，那么你将外设编译好的XX.rbf文件放到对应的nand中，然后在linux下开发对应的驱动程序。
另外一种就是HPS和FPGA同时启动，你把FPGA（主动串行）配置放到EPS中就OK。然后就和ARM开发一样的。
4、首先你确定的硬件的启动配置，在来更改preloader。

估计你是刚开始接触，先不要想着一步一步的来，首先让系统运行起来（参考开发板的资料），在增加FPGA,编写对应的linux驱动。

1、socFPGA系统结构里，增加了设备，通信端口的改变，等都要更新uboot,preloader,dtb,
2、uboot,preloader,dtb是由FPGA工程师生存的，同软件工程师没关系。
3、自定义的设备要写驱动