RK3576 Rock 4D: PCIe NVMe device not detected in mainline kernel despite working in U-Boot

[Leonard Lausen]

Hi Naoki,

Thank you for the advice. I flashed mainline U-Boot v2026.04-rc1 to SPI 
and confirmed NVME boot of mainline kernel 6.19-rc7 works with it.

Best regards
Leonard

Am 02.01.26 um 13:20 schrieb FUKAUMI Naoki:
> Hi Leonard,
> 
> On 12/24/25 22:30, Leonard Lausen wrote:
>> Attached the promised full boot log including the u-boot part and 
>> kernel PCI_DEBUG output.
> 
> Could you try mainline U-Boot and the DTB from either mainline Linux or 
> U-Boot?
> 
> The following HATs are working:
> 
> - Dual 2.5G Router HAT
> - Penta SATA HAT
> 
> with:
> 
> - U-Boot v2026.01-rc5
> - Linux v6.18.1/v6.19-rc3
> 
> Best regards,
> 
> -- 
> FUKAUMI Naoki
> Radxa Computer (Shenzhen) Co., Ltd.
> 
>> Am 24.12.25 um 14:29 schrieb Leonard Lausen:
>>> Hi linux-rockchip, Hi Nicolas,
>>>
>>> I'm testing mainline kernel support on the Rock 4D board and 
>>> encountering an issue where PCIe NVMe devices are not detected by the 
>>> kernel, despite working correctly in U-Boot. That is despite Nicolas 
>>> recently enabling PCIe support for Rock 4D in 
>>> 29ff4bbff793334d6aff2238fdc3ccf3859d60da.
>>>
>>> U-Boot successfully detects and initializes the NVMe device:
>>>
>>> pcie at 2a200000: PCIe Linking... LTSSM is 0x0
>>> pcie at 2a200000: PCIe Link up, LTSSM is 0x130011
>>> pcie at 2a200000: PCIE-0: Link up (Gen2-x1, Bus0)
>>>
>>> Device 0: Vendor: 0x1344 Rev: HPS0050  Prod: UTFRQ0170J8QSZ
>>>              Type: Hard Disk
>>>              Capacity: 488386.3 MB = 476.9 GB (1000215216 x 512)
>>>
>>>
>>> However, after kernel boot, only the PCIe root port is visible:
>>>
>>> 00:00.0 PCI bridge: Device 1d87:3576 (rev 01)
>>>
>>>
>>> PCIe rescan debug output:
>>>
>>> (initramfs) echo 1 > /sys/bus/pci/rescan
>>> [  106.782392] pci_bus 0000:00: scanning bus
>>> [  106.796249] pcieport 0000:00:00.0: restore config 0x2c: 0x00000000 
>>> -> 0x00000000
>>> [  106.797060] pcieport 0000:00:00.0: restore config 0x28: 0x00000000 
>>> -> 0x00000000
>>> [  106.797808] pcieport 0000:00:00.0: restore config 0x24: 0x0001fff1 
>>> -> 0x0001fff1
>>> [  106.798583] pcieport 0000:00:00.0: PME# disabled
>>> [  106.799069] pcieport 0000:00:00.0: scanning [bus 01-ff] behind 
>>> bridge, pass 0
>>> [  106.799795] pci_bus 0000:01: scanning bus
>>> [  106.803471] pci_bus 0000:01: bus scan returning with max=01
>>> [  106.804073] pcieport 0000:00:00.0: scanning [bus 01-ff] behind 
>>> bridge, pass 1
>>> [  106.804829] pci_bus 0000:00: bus scan returning with max=ff
>>> (initramfs) [  106.924154] pcieport 0000:00:00.0: save config 0x00: 
>>> 0x35761d87
>>> [  106.924765] pcieport 0000:00:00.0: save config 0x04: 0x00100507
>>> [  106.925364] pcieport 0000:00:00.0: save config 0x08: 0x06040001
>>> [  106.925958] pcieport 0000:00:00.0: save config 0x0c: 0x00010000
>>> [  106.926534] pcieport 0000:00:00.0: save config 0x10: 0x00000000
>>> [  106.932142] pcieport 0000:00:00.0: save config 0x14: 0x00000000
>>> [  106.934608] pcieport 0000:00:00.0: save config 0x18: 0x00ff0100
>>> [  106.937206] pcieport 0000:00:00.0: save config 0x1c: 0x000000f0
>>> [  106.939575] pcieport 0000:00:00.0: save config 0x20: 0x0000fff0
>>> [  106.941883] pcieport 0000:00:00.0: save config 0x24: 0x0001fff1
>>> [  106.944138] pcieport 0000:00:00.0: save config 0x28: 0x00000000
>>> [  106.946335] pcieport 0000:00:00.0: save config 0x2c: 0x00000000
>>> [  106.948490] pcieport 0000:00:00.0: save config 0x30: 0x00000000
>>> [  106.950601] pcieport 0000:00:00.0: save config 0x34: 0x00000040
>>> [  106.952698] pcieport 0000:00:00.0: save config 0x38: 0x00000000
>>> [  106.954765] pcieport 0000:00:00.0: save config 0x3c: 0x0002012d
>>> [  106.956847] pcieport 0000:00:00.0: PME# enabled
>>> ls /sys/bus/pci/devices/
>>> drwxr-xr-x 2 0 0 0 .
>>> drwxr-xr-x 5 0 0 0 ..
>>> lrwxrwxrwx 1 0 0 0 0000:00:00.0 -> ../../../devices/platform/ 
>>> soc/22000000.pcie/pci0000:00/0000:00:00.0
>>>
>>> The full boot log including the u-boot part and kernel PCI_DEBUG 
>>> output is also attached.
>>>
>>> Thanks for any insights!
>>>
>>> Best regards,
>>> Leonard
>>
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