# Purpose of the "reserved-region = \<&rpmsg\_reserved\>;" entry in dts

**URL:** <https://community.solid-run.com/t/purpose-of-the-reserved-region-rpmsg-reserved-entry-in-dts/910>\
**Category:** NXP i.MX8M Plus\
**Created:** [October 4, 2024, 7:25pm UTC](https://community.solid-run.com/t/purpose-of-the-reserved-region-rpmsg-reserved-entry-in-dts/910 "2024-10-04T19:25:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tanshihaj](https://avatars.discourse-cdn.com/v4/letter/t/eb8c5e/32.png) [@tanshihaj](https://community.solid-run.com/u/tanshihaj)\
**Post date:** [October 4, 2024, 7:25pm UTC](https://community.solid-run.com/t/purpose-of-the-reserved-region-rpmsg-reserved-entry-in-dts/910/1 "2024-10-04T19:25:54Z")

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I’m trying to add entry for the remoteproc device “fsl,imx8mm-cm4” for Hummingboard pulse’s device tree. I see that most of the memory used by rpmsg are declared in here [linux-stable/arch/arm64/boot/dts/freescale/imx8mm-hummingboard-pulse.dts at 46893bd6982f263943c72f852a912c556e86fef5 · SolidRun/linux-stable · GitHub](https://github.com/SolidRun/linux-stable/blob/46893bd6982f263943c72f852a912c556e86fef5/arch/arm64/boot/dts/freescale/imx8mm-hummingboard-pulse.dts#L75-L78) and then references in pcie0 block inside “reserved-region” block: [linux-stable/arch/arm64/boot/dts/freescale/imx8mm-hummingboard-pulse.dts at 46893bd6982f263943c72f852a912c556e86fef5 · SolidRun/linux-stable · GitHub](https://github.com/SolidRun/linux-stable/blob/46893bd6982f263943c72f852a912c556e86fef5/arch/arm64/boot/dts/freescale/imx8mm-hummingboard-pulse.dts#L804C2-L804C17).

However, I cannot understand why pcie0 node need this property and where in driver fsl,imx8mm-pcie driver it is used. Maybe somebody here understand it?

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**Author:** ![jnettlet](https://dub1.discourse-cdn.com/flex005/user_avatar/community.solid-run.com/jnettlet/32/62_2.png) [@jnettlet](https://community.solid-run.com/u/jnettlet)\
**Post date:** [October 7, 2024, 8:10am UTC](https://community.solid-run.com/t/purpose-of-the-reserved-region-rpmsg-reserved-entry-in-dts/910/2 "2024-10-07T08:10:20Z")

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That looks to be an incorrect merge. You can remove it.