topic Re: Difference between USB recovery and USB boot in i.MX Processors

Difference between USB recovery and USB boot

rajtantajtan — Thu, 18 Jul 2013 12:57:11 GMT

Hello,

I wonder what's the difference between entering USB recovery mode and changing boot switches to USB boot?

If I want to use mfgtools can I just plug USB OTG into my computer and set switches to USB boot and I'm all set to flash to nand and so on?

Yuri — Fri, 19 Jul 2013 04:06:12 GMT

You are right - to enter USB recovery mode the boot switch should be configured for USB boot.

Also USB recovery mode is entered automatically when boot, say from SD, is crashed (no SD inserted).

rajtantajtan — Fri, 19 Jul 2013 05:03:10 GMT

But what happens when you apply HIGH LEVEL voltage on PSWITCH? Is this the same as changing boot switches to USB boot?

Yuri — Fri, 19 Jul 2013 05:14:28 GMT

Yes,

according to section 11.4.3 (Software Functions/Recovery Mode) of the i.MX28 RM :

"When the PSWITCH pin is connected to VDDIO through a current limiting resistor, the

upper HW_POWER_STS_PSWITCH bit is also set. If this bit is set for more than five

seconds during ROM boot, the system executes the Freescale USB Firmware Recovery

function, as described in Boot Modes."