Thread: Kindle Touch bricked without USB
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Old 01-14-2012, 03:25 AM   #41
eureka
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Join Date: Dec 2011
Location: north (by northwest)
Device: Kindle Touch
Quote:
Originally Posted by rastik View Post
Hi, console showed nothing. It seems that it is intercepted by HW and when it detects Home button pressed during boot up it will not load uboot. And whatever is responsible for USB/HID download mode, it does not output anything to console.
Thinking of it that makes sense. This mode is wired in the i.MX50 chip and the chip is not aware of the console. Only apps are.
Wonderful! Thanks!

Yes, mode is wired in chip but it can initiated either by hardware (with setting of "boot mode" pins), or by software (with calling into USB downloader code from running program). I was unsure, which method is used in KT, but now it seems that Home button is connected to "boot mode" pin(s) and USB downloader mode is initiated by hardware even before U-Boot loading.
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