topic LS1021A: PCIe: using multiple MSIs for one EP in Layerscape https://community.nxp.com/t5/Layerscape/LS1021A-PCIe-using-multiple-MSIs-for-one-EP/m-p/546185#M1369 <HTML><HEAD></HEAD><BODY><P>I need to create a PCIe extension card which must support multiple MSIs, not MSI-X which is not possible on the card. Reading the LS1021A Reference Manual (Rev. 0, 11/2015) 10.2.47 SCFG_PEXMSIIR is the register which must be programmed as the Message Address Register to PCIe EP. The current driver pcie-designware + pci-layerscape does this.</P><P>So when a MSI occures the MSI Message Data contains the MSI number, e.g. 0h, 1h, 2h and so on, which is written to SCFG_PEXMSIIR in little-endian. Now reading the register definition IBS, containing the lowest byte of MSI Message Data, ignores the lowest 3 bits at all. MSI requires that MSi numbers are consequtive for one EP. How is this supposed to work if the lowest bits are ignored at all?</P></BODY></HTML> Thu, 07 Jul 2016 10:01:43 GMT alexanderstein 2016-07-07T10:01:43Z LS1021A: PCIe: using multiple MSIs for one EP https://community.nxp.com/t5/Layerscape/LS1021A-PCIe-using-multiple-MSIs-for-one-EP/m-p/546185#M1369 <HTML><HEAD></HEAD><BODY><P>I need to create a PCIe extension card which must support multiple MSIs, not MSI-X which is not possible on the card. Reading the LS1021A Reference Manual (Rev. 0, 11/2015) 10.2.47 SCFG_PEXMSIIR is the register which must be programmed as the Message Address Register to PCIe EP. The current driver pcie-designware + pci-layerscape does this.</P><P>So when a MSI occures the MSI Message Data contains the MSI number, e.g. 0h, 1h, 2h and so on, which is written to SCFG_PEXMSIIR in little-endian. Now reading the register definition IBS, containing the lowest byte of MSI Message Data, ignores the lowest 3 bits at all. MSI requires that MSi numbers are consequtive for one EP. How is this supposed to work if the lowest bits are ignored at all?</P></BODY></HTML> Thu, 07 Jul 2016 10:01:43 GMT https://community.nxp.com/t5/Layerscape/LS1021A-PCIe-using-multiple-MSIs-for-one-EP/m-p/546185#M1369 alexanderstein 2016-07-07T10:01:43Z