有客户反应MX6UL自制底板使用OTG烧写失败，打印信息卡到cpu_id is 0。造成这种情况的原因是USB_OTG1_ID引脚电平被拉低，设备不能作为从设备，接收不到windows的命令。 客户在自己做底板的时候需要注意： 1、USB_OTG1_ID引脚在硬件原理设计上不被下拉（如果客户只想作为主设备使用，不用OTG烧写可忽略此项）； 2、硬件上修改USB_OTG1_ID引脚后要相应的修改驱动； 3、排除在焊接上将USB_OTG1_ID拉低。 打印信息如下： U-Boot 2015.04-g5d63276bfe-dirty (Jan 10 2017 - 15:40:43) CPU: Freescale i.MX6UL rev1.1 at 396 MHz CPU: Temperature 45 C Reset cause: POR Board: MX6UL 14x14 EVK I2C: ready DRAM: 256 MiB MMC: FSL_SDHC: 0, FSL_SDHC: 1 Card did not respond to voltage select! MMC init failed Using default environment ...... ...... ...... clk: Not disabling unused clocks ALSA device list: No soundcards found. Freeing unused kernel memory: 360K (808c1000 - 8091b000) Starting UTP uuc 0.5 [built Aug 18 2015 20:29:48] UTP: Waiting for device to appear UTP: file/device node /dev/utp already exists cpu_id is 0 random: nonblocking pool is initialized |
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