在Vivado 2018.2中同时激活SD0 (sd卡)和SD1 (emmc)时出错，从emmc开始:插槽0没有mmc设备

开发环境

Vivado 2018.2

Petalinux 2018.2

问题描述

当同时激活 SD0 (对应SD卡座) 和 SD1 (对应板载 emmc) 时，当从 emmc 启动，报如下错误，

U-Boot 2018.01 (Apr 14 2020 - 10:49:36 +0800) Xilinx Zynq ZC702 Board: Xilinx Zynq Silicon: v3.1 DRAM: ECC disabled 1 GiB MMC: Card did not respond to voltage select! mmc_init: -95, time 23 sdhci@e0100000 - probe failed: -95 sdhci_transfer_data: Error detected in status(0x208000)! Card did not respond to voltage select! mmc_init: -95, time 23 SF: Detected w25q256 with page size 256 Bytes, erase size 4 KiB, total 32 MiB *** Warning - bad CRC, using default environment In: serial@e0000000 Out: serial@e0000000 Err: serial@e0000000 Board: Xilinx Zynq Silicon: v3.1 Net: ZYNQ GEM: e000b000, phyaddr ffffffff, interface rgmii-id eth0: ethernet@e000b000 U-BOOT for drive_usb_qspi_sd_ethernet_with_boot_from_emmc ethernet@e000b000 Waiting for PHY auto negotiation to complete......... TIMEOUT ! Hit any key to stop autoboot: 4 3 2 1 0 no mmc device at slot 0 Zynq>

解决方法

root cause: 配置 Primary SD 为 SD1 后，对应到更改没有更新到 u-boot 中去。

打开 <petalinux-project-path>/project-spec/meta-plnx-generated/recipes-bsp/u-boot/configs 下的文件platform-auto.h，有如下宏，

... 'netboot=tftpboot ${netstart} ${kernel_img} && bootm' 'default_bootcmd=run uenvboot; run cp_kernel2ram && bootm ${netstart}' '' /* BOOTCOMMAND */ #define CONFIG_BOOTCOMMAND 'run default_bootcmd' #endif /* __PLNX_CONFIG_H */

打开 <petalinux-project-path>/project-spec/meta-user/recipes-bsp/u-boot/files 下到文件 platform-top.h，添加如下内容 (对上述宏作一个重置)，

/*************************************************************************************************************************************/ /* fix SD0 is sd card, SD1 is emmc, if no card insert into SD0 slot, zynq cannot detect SD1 emmc. (Vivado 2018.2 + Petalinux 2018.2) */ /*************************************************************************************************************************************/ #ifdef CONFIG_BOOTCOMMAND #undef CONFIG_BOOTCOMMAND #define CONFIG_BOOTCOMMAND 'mmc dev ${sdbootdev}; run default_bootcmd' #endif /*************************************************************************************************************************************/

重新编译工程即可。

参考文件

https://www.xilinx.com/support/answers/69780.html?tdsourcetag=s_pcqq_aiomsg

https://forums.xilinx.com/t5/Embedded-Linux/BOOting-image-ub-from-eMMC/m-p/979363/highlight/false

完。