On 3/1/22 14:58, Samuel Sieb wrote:
On 3/1/22 05:05, Robert Moskowitz wrote:
Well, did not try that. Put in another SD card that already has an
image on it. I can mount it and read it. Unmount and take the
device out of the SD slot, /dev/mmcblk0 still showing when I 'ls /dev' .
Are you able to read and write to an SD card that has a normal
filesystem on it?
So I *THINK* I want to get the system to realize that there is NO
/dev/mmcblk0 (normal situation) when the notebook's SD slot is empty.
It doesn't work like that. The SD card reader is always there, so the
device exists. It's like how you always have /dev/sr0 even if you
don't have a disc inserted.
I have nothing in the SD slot right now (oh, this is a Lenovol x140e).
'ls /dev/' does NOT list a mmcblk0.
I insert a mSD card in an SD adapter (don't have any full size SD cards
handy) and messages show:
Mar 1 17:05:20 lx140e kernel: mmc0: cannot verify signal voltage switch
Mar 1 17:05:20 lx140e kernel: mmc0: new ultra high speed SDR50 SDHC
card at address 0007
Mar 1 17:05:20 lx140e kernel: mmcblk0: mmc0:0007 SD8GB 7.42 GiB (ro)
Mar 1 17:05:20 lx140e kernel: mmcblk0: p1 p2 p3 p4
And lsblk shows:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 1G 0 part /boot
├─sda2 8:2 0 70G 0 part /
├─sda3 8:3 0 16G 0 part [SWAP]
├─sda4 8:4 0 1K 0 part
└─sda5 8:5 0 378.8G 0 part /home
mmcblk0 179:0 0 7.4G 1 disk
├─mmcblk0p1 179:1 0 29M 1 part
├─mmcblk0p2 179:2 0 488M 1 part
├─mmcblk0p3 179:3 0 488M 1 part
└─mmcblk0p4 179:4 0 2.8G 1 part
zram0 252:0 0 8G 0 disk [SWAP]
ls /dev/ lists mmcblk0 as well now.
Pull the SD and I see:
Mar 1 17:06:54 lx140e kernel: mmc0: card 0007 removed
Mar 1 17:06:54 lx140e systemd-homed[727]: block device
/sys/devices/pci0000:00/0000:00:02.5/0000:04:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:0007/block/mmcblk0/mmcblk0p2
has been removed.
Mar 1 17:06:55 lx140e systemd-homed[727]: block device
/sys/devices/pci0000:00/0000:00:02.5/0000:04:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:0007/block/mmcblk0/mmcblk0p1
has been removed.
Mar 1 17:06:55 lx140e systemd-homed[727]: block device
/sys/devices/pci0000:00/0000:00:02.5/0000:04:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:0007/block/mmcblk0/mmcblk0p4
has been removed.
Mar 1 17:06:55 lx140e systemd-homed[727]: block device
/sys/devices/pci0000:00/0000:00:02.5/0000:04:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:0007/block/mmcblk0/mmcblk0p3
has been removed.
Mar 1 17:06:55 lx140e systemd-homed[727]: block device
/sys/devices/pci0000:00/0000:00:02.5/0000:04:00.0/rtsx_pci_sdmmc.0/mmc_host/mmc0/mmc0:0007/block/mmcblk0
has been removed.
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