On 21/02/2022 20:38, Ben Dooks wrote:
The fu740 PCIe core does not probe any devices on the SiFive Unmatched board without this fix from U-Boot (or having U-Boot explicitly start the PCIe via either boot-script or user command). The fix claims to set the link-speed to gen1 to get the probe to work. As this is a copy from U-Boot, the code is assumed to be correct and does fix the issue on the Unmatched. The code is at: https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/pci/pcie_dw_sifive.c#L271 The code has been this way since the driver was commited in: https://source.denx.de/u-boot/u-boot/-/commit/416395c772018c6bf52aad36aca163115001793f
Apologies everyone, messed up sending v3 so re-sent as v4. -- Ben Dooks http://www.codethink.co.uk/ Senior Engineer Codethink - Providing Genius https://www.codethink.co.uk/privacy.html
