https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/m-p/2389681#M16762 <P>Dear support,</P><P>&nbsp;The customer used the LS1043AXN8QQB platform and set the CPU dynamic frequency adjustment from 1.6GHz to 800MHz and 500MHz. It was found that RCU stall and PCIE communication abnormality occurred when the CPU ran at 500MHz.</P><P>According to the RM and datasheet of the chip, LS1043 supports 1GHz to 1.6GHz. The official document does not mention the minimum supported frequency for dynamic frequency adjustment. It is uncertain whether 500MHz is supported?</P><P>Does LS1043A support dynamic frequency adjustment when the CPU is running normally?</P><P>the customer projects (LS1043AXN8QQB ) used version:</P><P>Linux 5.4.301</P><P>LS1043A RDB Board</P><P>4-cores CPU</P><P>QCA6390 WiFi chip</P><P>Marvell 88E6393X Switch</P><P>512GB SATA SSD</P><P>eMMC 32GB</P><P>Customer feedback: Regardless of whether the fixed frequency is at 500MHz or the dynamic frequency is adjusted to 500MHz, the system will experience abnormalities, mainly manifested as PCIE communication abnormalities and RCU stall system freezing.</P><P>&nbsp;</P><P>The customer wants an official response from NXP.</P> Thu, 02 Jul 2026 10:32:42 GMT Nancy_LAN 2026-07-02T10:32:42Z https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/m-p/2389681#M16762 <P>Dear support,</P><P>&nbsp;The customer used the LS1043AXN8QQB platform and set the CPU dynamic frequency adjustment from 1.6GHz to 800MHz and 500MHz. It was found that RCU stall and PCIE communication abnormality occurred when the CPU ran at 500MHz.</P><P>According to the RM and datasheet of the chip, LS1043 supports 1GHz to 1.6GHz. The official document does not mention the minimum supported frequency for dynamic frequency adjustment. It is uncertain whether 500MHz is supported?</P><P>Does LS1043A support dynamic frequency adjustment when the CPU is running normally?</P><P>the customer projects (LS1043AXN8QQB ) used version:</P><P>Linux 5.4.301</P><P>LS1043A RDB Board</P><P>4-cores CPU</P><P>QCA6390 WiFi chip</P><P>Marvell 88E6393X Switch</P><P>512GB SATA SSD</P><P>eMMC 32GB</P><P>Customer feedback: Regardless of whether the fixed frequency is at 500MHz or the dynamic frequency is adjusted to 500MHz, the system will experience abnormalities, mainly manifested as PCIE communication abnormalities and RCU stall system freezing.</P><P>&nbsp;</P><P>The customer wants an official response from NXP.</P> Thu, 02 Jul 2026 10:32:42 GMT https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/m-p/2389681#M16762 Nancy_LAN 2026-07-02T10:32:42Z https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/m-p/2390243#M16767 <P>Please refer to</P> <P><A href="https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/td-p/2389683" target="_blank">https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/td-p/2389683</A></P> Fri, 03 Jul 2026 09:25:28 GMT https://community.nxp.com/t5/Layerscape/LS1043AXN8QQB-DVFS/m-p/2390243#M16767 yipingwang 2026-07-03T09:25:28Z