topic Re: DIR_BT_DIS? in i.MX Processors

DIR_BT_DIS?

bw1 — Mon, 14 Jan 2019 04:17:49 GMT

Does the DIR_BT_DIS apply to all external memory boot instances (e.g. FlexSPI NOR) or just enhanced Direct Memory Access? In other words if it is set, then booting from any external memory is disabled?

The reference manual doesn't provide much detail about this efuse. It refers to "NXP reserved modes" in one section, but also in the SRC_SBMR2 section has: "DIR_BT_DIS shows the state of the DIR_BT_DIS fuse. See Chapter 5, Fusemap for additional information on this fuse." Chapter 5 is "Enhanced Direct Memory Access".

Re: DIR_BT_DIS?

Yuri — Tue, 15 Jan 2019 05:47:27 GMT

Hello,

Really the mentioned fuse is "enable/disable Freescale Reserved Modes" and not

"Direct Boot from External Memory". Direct Boot from External Memory is not used

in i.MX6.

Have a great day,

Yuri

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Re: DIR_BT_DIS?

kanimozhi_t — Thu, 12 May 2022 07:30:45 GMT

@Yuri thanks for the info! What do you mean by "enable/disable Freescale Reserved Modes"? Could you provide us more context?

Is "DIR_BT_DIS" applicable to i.MX 6SX processor? (we can't find it in the security reference manual)