> -----Original Message----- > From: Jean Delvare [mailto:jdelvare@xxxxxxx] > Sent: Thursday, June 1, 2017 6:08 PM > To: x86@xxxxxxxxxx; linux-pci@xxxxxxxxxxxxxxx > Cc: K, Narendra <Narendra_K@xxxxxxxx>; Hargrave, Jordan > <Jordan_Hargrave@xxxxxxxx>; Iyer, Shyam <Shyam_Iyer@xxxxxxxx>; Bjorn > Helgaas <bhelgaas@xxxxxxxxxx> > Subject: dmi type 0xB1 record - unknown flag > > Hi all, > Hi Jean, > I see the following message in my kernel log: > > dmi type 0xB1 record - unknown flag > > This is on a Dell Optiplex 9020 workstation. I see the message comes > from: > > static void __init read_dmi_type_b1(const struct dmi_header *dm, > void *private_data) { > (...) > switch (((*(u32 *)d) >> 9) & 0x03) { > case 0x00: > printk(KERN_INFO "dmi type 0xB1 record - unknown flag\n"); > break; > > What is the value of this message? Is there anything which needs to be done > to properly support such systems? This function was added to avoid adding systems to the 'pciprobe_dmi_table' and set breadth first sorting in a generic way. This flag is a hint to indicate the sort method to be used. The value 0x01 indicates that PCI breadth first sort be used. ' find_sort_method' function checks if smbios_type_b1_flag is set to 1 and if yes, calls 'set_bf_sort '. This function sets ' pci_bf_sort' to 'pci_dmi_bf'. The value 0x00 is not a valid value. When the flag is 0x00, the sort method will be the default that is decided by the kernel. There is no additional handling required for such a system. With regards, Narendra K
