Ethernet is one of a few IPs in U-Boot that depend on DMA to operate. However there are a few missing registers ranges in the udmap nodes need to properly setup DMA for the am65x.
A fix has been added to the Linux kernel[0] to add these ranges however they have not made it to a Linux tag. To keep DMA operational until the next DT sync from Linux, add these ranges to the *-u-boot.dtsi with a note for our future selves.
[0] https://lore.kernel.org/r/20231213135138.929517-2-vigneshr@ti.com Signed-off-by: Bryan Brattlof bb@ti.com --- arch/arm/dts/k3-am654-base-board-u-boot.dtsi | 32 ++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi index 9cd8c353c515b..645241da322a5 100644 --- a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi +++ b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi @@ -260,3 +260,35 @@ &mcu_r5fss0 { ti,cluster-mode = <0>; }; + +/* The DMA driver requires a few extra register ranges + * which are missing for the am65x. A patch has been + * sent and will be synced after the v6.8-rc1 linux + * tag is published + */ +&main_udmap { + reg = <0x0 0x31150000 0x0 0x100>, + <0x0 0x34000000 0x0 0x100000>, + <0x0 0x35000000 0x0 0x100000>, + <0x0 0x30b00000 0x0 0x10000>, + <0x0 0x30c00000 0x0 0x10000>, + <0x0 0x30d00000 0x0 0x8000>; + reg-names = "gcfg", "rchanrt", "tchanrt", + "tchan", "rchan", "rflow"; +}; + +/* The DMA driver requires a few extra register ranges + * which are missing for the am65x. A patch has been + * sent and will be synced after the v6.8-rc1 linux + * tag is published + */ +&mcu_udmap { + reg = <0x0 0x285c0000 0x0 0x100>, + <0x0 0x2a800000 0x0 0x40000>, + <0x0 0x2aa00000 0x0 0x40000>, + <0x0 0x284a0000 0x0 0x4000>, + <0x0 0x284c0000 0x0 0x4000>, + <0x0 0x28400000 0x0 0x2000>; + reg-names = "gcfg", "rchanrt", "tchanrt", + "tchan", "rchan", "rflow"; +};