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。