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elmar283
Apprentice
Apprentice


Joined: 06 Dec 2004
Posts: 299
Location: Haarlem, Netherlands

PostPosted: Sun Sep 04, 2016 10:33 am    Post subject: [solved] /dev/sda and /dev/sdb keep switching Reply with quote

I have installed gentoo on my Macbook Pro 2015.
I use refind to boot my system. In the kernel I define the path to the root directory (CONFIG_CMDLINE="root=/dev/sdb7").

This is my partition scheme:
Code:

/dev/sdb5      /boot      ext2      noatime      1 2
/dev/sdb7      /      ext4      noatime      0 1
/dev/sdb6      none      swap      sw      0 0
/dev/sdb1      /boot/efi   vfat      noatime      0 0
/dev/sdb4      /mnt/files   vfat      noatime      0 0


After building the kernel I copy the kernel to '/boot/efi/EFI/Boot/Gentoo_446_x64.efi'

What goes wrong is that after every build the sda becomes sdb and back.
The other sd is the sd cardreader.

I have two questions:
1: What is causing the sda sdb switch after rebuilding the kernel?
2: How can make shure sda and sdb doesn't switch anymore?

Here are some configs:
Code:

elmar@randomdentgentoo /boot/efi/EFI $ sudo lspci -k
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
   Subsystem: Apple Inc. Broadwell-U Host Bridge -OPI
   Kernel driver in use: bdw_uncore
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)
   Subsystem: Apple Inc. Broadwell-U Integrated Graphics
   Kernel driver in use: i915
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
   Subsystem: Apple Inc. Broadwell-U Audio Controller
   Kernel driver in use: snd_hda_intel
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP USB xHCI Controller
   Kernel driver in use: xhci_hcd
00:15.0 DMA controller: Intel Corporation Wildcat Point-LP Serial IO DMA Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP Serial IO DMA Controller
00:15.4 Serial bus controller [0c80]: Intel Corporation Wildcat Point-LP Serial IO GSPI Controller #1 (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP Serial IO GSPI Controller
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP MEI Controller
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP High Definition Audio Controller
   Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
   Kernel driver in use: pcieport
00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3)
   Kernel driver in use: pcieport
00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3)
   Kernel driver in use: pcieport
00:1c.4 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #5 (rev e3)
   Kernel driver in use: pcieport
00:1c.5 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #6 (rev e3)
   Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP LPC Controller
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP SMBus Controller
00:1f.6 Signal processing controller: Intel Corporation Wildcat Point-LP Thermal Management Controller (rev 03)
   Subsystem: Intel Corporation Wildcat Point-LP Thermal Management Controller
02:00.0 Multimedia controller: Broadcom Corporation 720p FaceTime HD Camera
   Subsystem: Broadcom Corporation 720p FaceTime HD Camera
03:00.0 Network controller: Broadcom Corporation BCM43602 802.11ac Wireless LAN SoC (rev 01)
   Subsystem: Apple Inc. BCM43602 802.11ac Wireless LAN SoC
   Kernel driver in use: brcmfmac
   Kernel modules: brcmfmac
04:00.0 SATA controller: Samsung Electronics Co Ltd Device a801 (rev 01)
   Subsystem: Samsung Electronics Co Ltd Device a801
   Kernel driver in use: ahci
05:00.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
06:00.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
06:03.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
06:04.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
06:05.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
06:06.0 PCI bridge: Intel Corporation Device 156d
   Kernel driver in use: pcieport
07:00.0 System peripheral: Intel Corporation Device 156c
   Kernel driver in use: thunderbolt


Code:

elmar@randomdentgentoo /boot/efi/EFI $ cat /proc/cpuinfo
processor   : 0
vendor_id   : GenuineIntel
cpu family   : 6
model      : 61
model name   : Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
stepping   : 4
microcode   : 0x21
cpu MHz      : 1200.000
cache size   : 3072 KB
physical id   : 0
siblings   : 4
core id      : 0
cpu cores   : 2
apicid      : 0
initial apicid   : 0
fpu      : yes
fpu_exception   : yes
cpuid level   : 20
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap xsaveopt
bugs      :
bogomips   : 5399.78
clflush size   : 64
cache_alignment   : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor   : 1
vendor_id   : GenuineIntel
cpu family   : 6
model      : 61
model name   : Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
stepping   : 4
microcode   : 0x21
cpu MHz      : 700.000
cache size   : 3072 KB
physical id   : 0
siblings   : 4
core id      : 1
cpu cores   : 2
apicid      : 2
initial apicid   : 2
fpu      : yes
fpu_exception   : yes
cpuid level   : 20
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap xsaveopt
bugs      :
bogomips   : 5399.78
clflush size   : 64
cache_alignment   : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor   : 2
vendor_id   : GenuineIntel
cpu family   : 6
model      : 61
model name   : Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
stepping   : 4
microcode   : 0x21
cpu MHz      : 1200.000
cache size   : 3072 KB
physical id   : 0
siblings   : 4
core id      : 0
cpu cores   : 2
apicid      : 1
initial apicid   : 1
fpu      : yes
fpu_exception   : yes
cpuid level   : 20
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap xsaveopt
bugs      :
bogomips   : 5399.78
clflush size   : 64
cache_alignment   : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

processor   : 3
vendor_id   : GenuineIntel
cpu family   : 6
model      : 61
model name   : Intel(R) Core(TM) i5-5257U CPU @ 2.70GHz
stepping   : 4
microcode   : 0x21
cpu MHz      : 1200.000
cache size   : 3072 KB
physical id   : 0
siblings   : 4
core id      : 1
cpu cores   : 2
apicid      : 3
initial apicid   : 3
fpu      : yes
fpu_exception   : yes
cpuid level   : 20
wp      : yes
flags      : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch ida arat epb pln pts dtherm intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdseed adx smap xsaveopt
bugs      :
bogomips   : 5399.78
clflush size   : 64
cache_alignment   : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:


Code:

elmar@randomdentgentoo /boot/efi/EFI $ ls /boot/efi/EFI/
APPLE  Boot  refind  tools


Code:
elmar@randomdentgentoo ~ $ ls /dev/sd*
/dev/sda  /dev/sdb  /dev/sdb1  /dev/sdb2  /dev/sdb3  /dev/sdb4  /dev/sdb5  /dev/sdb6  /dev/sdb7


Code:

elmar@randomdentgentoo ~ $ udevadm info -a /dev/sda

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host1/target1:0:0/1:0:0:0/block/sda':
    KERNEL=="sda"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{ro}=="0"
    ATTR{size}=="0"
    ATTR{stat}=="       0        0        0        0        0        0        0        0        0        0        0"
    ATTR{range}=="16"
    ATTR{discard_alignment}=="0"
    ATTR{events}=="media_change"
    ATTR{ext_range}=="256"
    ATTR{events_poll_msecs}=="-1"
    ATTR{alignment_offset}=="0"
    ATTR{inflight}=="       0        0"
    ATTR{removable}=="1"
    ATTR{capability}=="51"
    ATTR{events_async}==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host1/target1:0:0/1:0:0:0':
    KERNELS=="1:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{rev}=="3.00"
    ATTRS{type}=="0"
    ATTRS{scsi_level}=="7"
    ATTRS{model}=="SD Card Reader  "
    ATTRS{state}=="running"
    ATTRS{queue_type}=="none"
    ATTRS{iodone_cnt}=="0x33d"
    ATTRS{iorequest_cnt}=="0x33d"
    ATTRS{device_busy}=="0"
    ATTRS{evt_capacity_change_reported}=="0"
    ATTRS{timeout}=="30"
    ATTRS{evt_media_change}=="0"
    ATTRS{max_sectors}=="240"
    ATTRS{ioerr_cnt}=="0x33c"
    ATTRS{queue_depth}=="1"
    ATTRS{vendor}=="APPLE   "
    ATTRS{evt_soft_threshold_reached}=="0"
    ATTRS{device_blocked}=="0"
    ATTRS{evt_mode_parameter_change_reported}=="0"
    ATTRS{evt_lun_change_reported}=="0"
    ATTRS{evt_inquiry_change_reported}=="0"
    ATTRS{iocounterbits}=="32"
    ATTRS{inquiry}==""
    ATTRS{eh_timeout}=="10"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host1/target1:0:0':
    KERNELS=="target1:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0/host1':
    KERNELS=="host1"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.0':
    KERNELS=="2-3:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb-storage"
    ATTRS{bInterfaceClass}=="08"
    ATTRS{bInterfaceSubClass}=="06"
    ATTRS{bInterfaceProtocol}=="50"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{authorized}=="1"
    ATTRS{supports_autosuspend}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceNumber}=="00"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2/2-3':
    KERNELS=="2-3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{devpath}=="3"
    ATTRS{idVendor}=="05ac"
    ATTRS{speed}=="5000"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="9"
    ATTRS{busnum}=="2"
    ATTRS{devnum}=="2"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="896mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="a0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="0"
    ATTRS{bcdDevice}=="0820"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="000000000820"
    ATTRS{version}==" 3.00"
    ATTRS{urbnum}=="5822"
    ATTRS{ltm_capable}=="yes"
    ATTRS{manufacturer}=="Apple"
    ATTRS{removable}=="fixed"
    ATTRS{idProduct}=="8406"
    ATTRS{bDeviceClass}=="00"
    ATTRS{product}=="Card Reader"

  looking at parent device '/devices/pci0000:00/0000:00:14.0/usb2':
    KERNELS=="usb2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bDeviceProtocol}=="03"
    ATTRS{devpath}=="0"
    ATTRS{idVendor}=="1d6b"
    ATTRS{speed}=="5000"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bMaxPacketSize0}=="9"
    ATTRS{authorized_default}=="1"
    ATTRS{busnum}=="2"
    ATTRS{devnum}=="1"
    ATTRS{configuration}==""
    ATTRS{bMaxPower}=="0mA"
    ATTRS{authorized}=="1"
    ATTRS{bmAttributes}=="e0"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{maxchild}=="4"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{bcdDevice}=="0404"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{quirks}=="0x0"
    ATTRS{serial}=="0000:00:14.0"
    ATTRS{version}==" 3.00"
    ATTRS{urbnum}=="39"
    ATTRS{ltm_capable}=="yes"
    ATTRS{manufacturer}=="Linux 4.4.6-gentoo xhci-hcd"
    ATTRS{removable}=="unknown"
    ATTRS{idProduct}=="0003"
    ATTRS{bDeviceClass}=="09"
    ATTRS{product}=="xHCI Host Controller"

  looking at parent device '/devices/pci0000:00/0000:00:14.0':
    KERNELS=="0000:00:14.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="xhci_hcd"
    ATTRS{irq}=="50"
    ATTRS{subsystem_vendor}=="0x8086"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x0c0330"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="0f"
    ATTRS{device}=="0x9cb1"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x7270"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""


Code:

elmar@randomdentgentoo ~ $ udevadm info -a /dev/sdb

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/ata1/host0/target0:0:0/0:0:0:0/block/sdb':
    KERNEL=="sdb"
    SUBSYSTEM=="block"
    DRIVER==""
    ATTR{ro}=="0"
    ATTR{size}=="490234752"
    ATTR{stat}=="   48299       96  1185015     8164    30467    64495  2731898    72698        0     8638    81137"
    ATTR{range}=="16"
    ATTR{discard_alignment}=="0"
    ATTR{events}==""
    ATTR{ext_range}=="256"
    ATTR{events_poll_msecs}=="-1"
    ATTR{alignment_offset}=="0"
    ATTR{inflight}=="       0        0"
    ATTR{removable}=="0"
    ATTR{capability}=="50"
    ATTR{events_async}==""

  looking at parent device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/ata1/host0/target0:0:0/0:0:0:0':
    KERNELS=="0:0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS=="sd"
    ATTRS{rev}=="SA0Q"
    ATTRS{type}=="0"
    ATTRS{scsi_level}=="6"
    ATTRS{model}=="APPLE SSD SM0256"
    ATTRS{state}=="running"
    ATTRS{queue_type}=="none"
    ATTRS{iodone_cnt}=="0x13720"
    ATTRS{iorequest_cnt}=="0x1386a"
    ATTRS{queue_ramp_up_period}=="120000"
    ATTRS{device_busy}=="0"
    ATTRS{evt_capacity_change_reported}=="0"
    ATTRS{timeout}=="30"
    ATTRS{evt_media_change}=="0"
    ATTRS{ioerr_cnt}=="0x11"
    ATTRS{queue_depth}=="31"
    ATTRS{vendor}=="ATA     "
    ATTRS{evt_soft_threshold_reached}=="0"
    ATTRS{device_blocked}=="0"
    ATTRS{evt_mode_parameter_change_reported}=="0"
    ATTRS{evt_lun_change_reported}=="0"
    ATTRS{evt_inquiry_change_reported}=="0"
    ATTRS{iocounterbits}=="32"
    ATTRS{inquiry}==""
    ATTRS{vpd_pg80}==""
    ATTRS{vpd_pg83}==""
    ATTRS{eh_timeout}=="10"

  looking at parent device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/ata1/host0/target0:0:0':
    KERNELS=="target0:0:0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/ata1/host0':
    KERNELS=="host0"
    SUBSYSTEMS=="scsi"
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0/ata1':
    KERNELS=="ata1"
    SUBSYSTEMS==""
    DRIVERS==""

  looking at parent device '/devices/pci0000:00/0000:00:1c.5/0000:04:00.0':
    KERNELS=="0000:04:00.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="ahci"
    ATTRS{irq}=="49"
    ATTRS{subsystem_vendor}=="0x144d"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x010601"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{dma_mask_bits}=="64"
    ATTRS{local_cpus}=="0f"
    ATTRS{device}=="0xa801"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x144d"
    ATTRS{subsystem_device}=="0xa801"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"

  looking at parent device '/devices/pci0000:00/0000:00:1c.5':
    KERNELS=="0000:00:1c.5"
    SUBSYSTEMS=="pci"
    DRIVERS=="pcieport"
    ATTRS{irq}=="17"
    ATTRS{subsystem_vendor}=="0x8086"
    ATTRS{broken_parity_status}=="0"
    ATTRS{class}=="0x060400"
    ATTRS{driver_override}=="(null)"
    ATTRS{consistent_dma_mask_bits}=="32"
    ATTRS{dma_mask_bits}=="32"
    ATTRS{local_cpus}=="0f"
    ATTRS{device}=="0x9c9a"
    ATTRS{enable}=="1"
    ATTRS{msi_bus}=="1"
    ATTRS{local_cpulist}=="0-3"
    ATTRS{vendor}=="0x8086"
    ATTRS{subsystem_device}=="0x7270"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="0"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""


Last edited by elmar283 on Sun Sep 04, 2016 11:58 am; edited 1 time in total
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Buffoon
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PostPosted: Sun Sep 04, 2016 10:51 am    Post subject: Reply with quote

You can use PARTUID on kernel command line, you need to modify fstab, too.

Or you can build whatever driver is needed for your SD as module, then it won't be loaded before / is mounted.
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i4dnf
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PostPosted: Sun Sep 04, 2016 10:59 am    Post subject: Reply with quote

You can pass
Code:

options "root=PARTUUID=sdb7partuuid"

or
Code:

options "root=UUID=sdb7uuid"

to the kernel in refind.conf.
You get sdb7partuuid and sdb7uuid by running:
Code:
blkid /dev/sdb7


You can also mount by UUID or PARTUUID or even LABEL in fstab, instead of /dev/sdXy, thus regardless of the order the kernel discovers the drives they will be mounted to the same constant mountpoints, e.g.:

Code:

PARTUUID=sdb5partuuid /boot ext2 noatime 1 2
UUID=sdb7uuid / ext4 noatime 0 1
LABEL=SWAP none swap sw 0 0
UUID=sdb1uuid /boot/efi vfat noatime 0 0
PARTUUID=sdb4partuuid /mnt/files vfat noatime 0 0

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PostPosted: Sun Sep 04, 2016 11:03 am    Post subject: Reply with quote

Kernel cannot handle UUID, to use UUID initrd is needed.
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PostPosted: Sun Sep 04, 2016 11:05 am    Post subject: Reply with quote

elmar283,

sda is the first HDD detected by the kernel, sdb the second and so on.
Its not deterministic but the detection order is normally fixed.
Consider it a feature.

The fix is to use deterministic names for your partitions or filesystems.
You may use filesystem labels, if your filesystems support labels.
You may use filesystem UUIDs. These are created by mkfs.
You may use partition UUIDs. Created by partitioning tools.

There is a constraint for mounting root. For filesystem lables and filesystem UUIDs, the userspace mount command needs to be available.
It probably is if you have an initrd. The kernel can use partition UUIDs without any userspace help.
Code:
$ /sbin/blkid
/dev/sda1: UUID="9392926d-6408-6e7a-8663-82834138a597" TYPE="linux_raid_member" PARTUUID="0553caf4-01"
...

blkid will tell you the values you need. Notice that the filesystem UUID="9392926d-6408-6e7a-8663-82834138a597" is not the same as the PARTUUID="0553caf4-01".

You will need to fix your root= on the kernel command line and /etc/fstab.

By way of a fstab example, I have
Code:
# now ssd
UUID=cf559dbe-81bb-45b7-bbdd-0bcdc81e066b               /               ext4            noatime,discard         0 1

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elmar283
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PostPosted: Sun Sep 04, 2016 11:10 am    Post subject: Reply with quote

Thanks all.
I don not have an initrd, so uuid's etc are not supported.
So I'm trying the dirty fix by making my ssd card reader a module.
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mv
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PostPosted: Sun Sep 04, 2016 11:23 am    Post subject: Reply with quote

elmar283 wrote:
I don not have an initrd, so uuid's etc are not supported.

But PARTUUID's are (and in /etc/fstab you can use UUID=... or LABEL=... without any initrd)
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PostPosted: Sun Sep 04, 2016 11:26 am    Post subject: Reply with quote

Yes that part I understand.
It is the kernel part I'm not shure about.
I'll get a kernel panic because /dev/sdb7 or /dev/sda7 is not known.
If the kernel understands the uuid then I will do that, but from the reactions I understand it cannot.
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PostPosted: Sun Sep 04, 2016 11:35 am    Post subject: Reply with quote

elmar283,

root=PARTUUID=<your_root_RARTUUID> will work for you.
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elmar283
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PostPosted: Sun Sep 04, 2016 11:57 am    Post subject: Reply with quote

Thanks, it worked:
Code:

elmar@randomdentgentoo /boot $ cat /etc/fstab
# /etc/fstab: static file system information.
#
# noatime turns off atimes for increased performance (atimes normally aren't
# needed); notail increases performance of ReiserFS (at the expense of storage
# efficiency).  It's safe to drop the noatime options if you want and to
# switch between notail / tail freely.
#
# The root filesystem should have a pass number of either 0 or 1.
# All other filesystems should have a pass number of 0 or greater than 1.
#
# See the manpage fstab(5) for more information.
#

# <fs>         <mountpoint>   <type>      <opts>      <dump/pass>

# NOTE: If your BOOT partition is ReiserFS, add the notail option to opts.
#/dev/sda5      /boot      ext2      noatime      1 2
#/dev/sda7      /      ext4      noatime      0 1
#/dev/sda6      none      swap      sw      0 0
#/dev/sda1      /boot/efi   vfat      noatime      0 0
#/dev/sda4      /mnt/files   vfat      noatime      0 0

UUID=d4fd369a-0e36-42cf-9fda-9b20cd78724d   /boot      ext2   noatime 1 2
UUID=923da334-aedf-428a-b6cc-860c98edcdf1   /      ext4   noatime   0 1
UUID=2a9a5c98-1747-44f8-ba64-02f5d266563a   none      swap   sw   0 0
UUID=67E3-17ED               /boot/efi   vfat   noatime   0 0
UUID=ECAA-4358               /mnt/files   vfat   noatime 0 0


Code:

elmar@randomdentgentoo /boot $ cat /usr/src/linux/.config |grep root=
CONFIG_CMDLINE="root=PARTUUID=a0c18905-ed0b-48c2-9cbd-ca9f3a25f6d6"
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