SCFW timing output interpretation

stuartrubin — Fri, 17 Apr 2020 19:31:03 GMT

While working on some SECO features, I have enabled the debug monitor in the SCFW. To my pleasant surprise, the monitor outputs some timing information. This is very important to what we are working on. The output is somewhat obvious as to what it means, but there are no details. My output is:

ROM boot time = 46084 usec

SCFW boot time = 52751 usec

Banner = 10 usec

Init = 10509 usec

Config = 4014 usec

DDR = 14633 usec

SConfig = 3054 usec

Prep = 14862 usec

Is there any documentation as to what exactly is being timed here? We are especially interested in how the first two numbers (ROM boot and SCFW boot times) relate to Figure 2 in "Secure Boot on iMX 8 and iMX 8x Familis using AHAB" application note. Exactly what's happening in each of these timing steps?

Thank you

Re: SCFW timing output interpretation

igorpadykov — Sat, 18 Apr 2020 09:07:01 GMT

Hi Stuart

additional details can be found in sect.3.8.1 Standard Boot sc_fw_port.pdf

document included in SCFW Porting Kit

Best regards
igor
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topic SCFW timing output interpretation in i.MX Processors

SCFW timing output interpretation

Re: SCFW timing output interpretation