imx7 dual recovery boot

[rgl_iot]

Hi,

we are in the process of designing a system based on an i.MX7 dual.

The default boot device is an eMMC flash. I also would like to use the SPI recovery boot option but i'm a bit confused on how it is configured. As far as i understand the device detects a broken image on the primary boot device and then uses the SPI flash for recovery.

For this i have to set BOOT_CFG4[6] to 1. So far so clear, but i also have to configure BOOT_CFG[11..9] to boot from SPI which will prevent boot from eMMC!?

Could you please clarify this.

Best reagrds,

Ralf

[igorpadykov · Accepted solution]

Hi Ralf

one can look at Table 6-47. Serial ROM boot eFUSE descriptions

i.MX 7Dual Applications Processor Reference Manual

settings 0x480[31:29] Recovery port selection is available only by fuses.

Best regards
igor
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[rgl_iot]

Hi Igor,

ok i think i got it. The BOOT_CFG (aka 0x470[19:0]) entries in table 6-47 are for regular boot from SPI flash except BOOT_CFG[17] which enables recovery boot that is configured in 0x480[31:26].

Is there an application note on i.MX boot options and configurations?

Best regards,

Ralf

[igorpadykov]

Hi Ralf

application notes can be found on i.MX7D web page

i.MX 7Dual Applications Processors | Dual Arm® Cortex®-A7 + Cortex-M4 | NXP 

Best regards
igor