Hi Igor,
quite clear, many thanks.
Hi angelo
yes in case of any error, boot ROM falls back to serial downloader as described
for example in sect.8.2.5 Internal Boot mode i.MX6DQ Reference Manual
http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf
"If an error occurs during the internal boot, the boot code jumps to the Serial Downloader"
For some processors there are differencies in behaviour, for example in
SD/MMC manufacture mode, [sect.8.11 SD/MMC manufacture mode i.MX6SDL Reference Manual ]
http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6SDLRM.pdf
"When the internal boot and recover boot (if enabled) failed, the boot goes to the
SD/MMC manufacture mode before the serial download mode."
Note this is description for boot ROM, if processor executes custom bootloader this
may be not applicable.
Best regards
igor
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