title: How to get into uboot command prompt?
body: <p>I have a system that booted into Linux using UBOOT. I can see that it is booting when I connect to it via serial port. How can I stop it booting UBOOT and get the UBOOT command prompt? </p>
  
  <p>During boot, I can see the following messages on attached serial terminal:</p>
  
  <pre><code>Security Framework initialized
  Mount-cache hash table entries: 512
  CPU: Testing write buffer coherency: ok
  devtmpfs: initialized
  TI81XX: Map 0xb3200000 to 0xfe500000 for dram barrier
  TI81XX: Map 0x40300000 to 0xfe600000 for sram barrier
  omap_voltage_early_init: voltage driver support not added
  regulator: core version 0.5
  regulator: dummy:
  NET: Registered protocol family 16
  omap_voltage_domain_lookup: Voltage driver init not yet happened.Faulting!
  omap_voltage_add_dev: VDD specified does not exist!
  OMAP GPIO hardware version 0.1
  OMAP GPIO hardware version 0.1
  OMAP GPIO hardware version 0.1
  OMAP GPIO hardware version 0.1
  Cannot clk_get ck_32
  .....
  </code></pre>