之前介绍过用Qemu模拟运行uboot,然后从网络启动linux(用Qemu模拟vexpress-a9 (三)--- 实现用u-boot引导Linux内核),下面介绍用Qemu运行uboot,然后将存放在虚拟出来的SD卡里加载linux kernel、设备树,并运行。 一、编译uboot 下载最新的uboot,编译vexpress-a9: makeARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-vexpres...
之前介绍过用Qemu模拟运行uboot,然后从网络启动linux(用Qemu模拟vexpress-a9 (三)--- 实现用u-boot引导Linux内核),下面介绍用Qemu运行uboot,然后将存放在虚拟出来的SD卡里加载linux kernel、设备树,并运行。 一、编译uboot 下载最新的uboot,编译vexpress-a9: make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- vex...
To write an image that boots from an SD card (assumed to be /dev/sdb) default : with CONFIG_ROCKCHIP_SPL_BACK_TO_BROM tools/mkimage -n rk3288 -T rksd -d spl/u-boot-spl-dtb.bin out cat u-boot-dtb.bin >> out sudo dd if=out of=/dev/sdb seek=64 conv=notrunc Format sdcard ...
#ifdef CONFIG_SPL_SD_SUPPORTcaseBOOT_TYPE_SDCARD: printf("Load U-Boot from SD ...\n");spl_mmc_load_image(BOOT_DEVICE_MMC2);---从sd中读取uboot,并解析头到spl_iamge中,将uboot加载到DDR中。break;#endif...default: printf("Invalid boot mode 0x%x ...\n", boot_mode);while(1); }sw...
> I try to boot the device from sd card. Please clarify your intention because "sf" U-Boot commands are for SPI Flash. The SD card is handled by "mmc" U-Boot commands. Refer to the Linux SDK Infocenter section: Submit Form 0 Kudos Reply 07-04-2017 05:14 AM 5,866 Views ...
Linux 系统要启动需要通过 bootloader 程序引导,也就说芯片上电以后先运行一段 bootloader 程序。这段 bootloader 程序会先初始化 DDR 等外设,然后将 Linux 内核从 flash(NAND, NOR FLASH, SD, EMMC 等)拷贝到 DDR 中,最后启动 Linux 内核。bootloader最主要的工作就是启动Linux内核,bootloader和Linux内核的...
U-Boot 的全称是Universal Boot Loader,其作用就是引导系统。对于我们熟悉的 PC,上电后,通过 BIOS 引导操作系统 (Windows、Linux等)。对于嵌入式系统一般将这个引导程序称作 BootLoader,U-Boot 就是目前使用得最广泛的 BootLoader。 在前面的文章中,QEMU直接引导鸿蒙系统的 Linux 内核,这种方式缺少灵活性,关键是在实...
加载文件需要SD或者EMMC有完好的文件系统。 先将SD卡从开发板取出(开发板不要断电),通过读卡器插入 PC,复制一些文件到卡里,然后再重新插入开发板中 (SD卡拔出来时开发板不要断电,目的想测试一下 mmc rescan 命令作用)。SD卡拔掉之后,UBOOT一样可以运行,因为程序已经拷贝到DDR中运行了,只要不断电U-BOOT就可以正常...
Linux re-boot command: Linux will instruct the PMIC PF4210 to generate a power cycle, but there are also discrete regulators on the EVK, so also here I wouldn't guarantee that really everything starts from scratch And please tell me exactly what you've done when you say "after I mo...
The traditional SD card location the Allwinner BootROM loads from is 8KB (sector 16). This works fine with the old MBR partitioning scheme, which most SD cards come formatted with. However this is in the middle of a potential GPT partition table, which will become invalid in this step. ...