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Using Zynq with Linux

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Example 5.

U-Boot Commands

Before the autoboot starts, there is a default three-second count down. Users may press any key

during the count-down to interrupt the autoboot procedure and type in custom commands to boot

the Linux kernel manually.

Here are some of the most popular commands:

Printenv will print the environment variables of u-boot. (See Example 6.)

U-Boot 2011.03-dirty (Jul 11 2012 - 16:07:00)

DRAM: 512 MiB

MMC: SDHCI: 0

Using default environment

In: serial

Out: serial

Err: serial

Net: zynq_gem

Hit any key to stop autoboot: 0

Copying Linux from SD to RAM...

Device: SDHCI

Manufacturer ID: 3

OEM: 5344

Name: SU04G

Tran Speed: 25000000

Rd Block Len: 512

SD version 1.10

High Capacity: Yes

Capacity: 3965190144

Bus Width: 1-bit

reading zImage

2479640 bytes read

reading devicetree.dtb

5817 bytes read

reading ramdisk8M.image.gz

3694108 bytes read

## Starting application at 0x00008000 ...

Uncompressing Linux... done, booting the

kernel.

[ 0.000000] Booting Linux on physical CPU 0

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 22 23

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Digilent Embedded Linux Manuale Utente Pagina 10