Public bug reported:
The patch discussed here:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg720833.html
introduces an artificial size constraint for SD cards
that has no relation to reality.
I'm trying to use an _actual_ **physical** SD card,
and qemu tells me its size is "invalid".
Something here appears to be conceptually wrong.
--------------------------------------------------
# fdisk -l /dev/sdg
Disk /dev/sdg: 14.84 GiB, 15931539456 bytes, 31116288 sectors
Disk model: USB SD Reader
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x7a0c8bb0
Device Boot Start End Sectors Size Id Type
/dev/sdg1 2048 524287 522240 255M c W95 FAT32 (LBA)
/dev/sdg2 524288 31116287 30592000 14.6G 83 Linux
# qemu-system-aarch64 -M raspi3 -m 1G -kernel vmlinuz-5.4.79-v8 -dtb
bcm2837-rpi-3-b-plus.dtb -append console=ttyAMA0\ root=/dev/mmcblk0p2\ rw
-nographic -serial mon:stdio -drive file=/dev/sdg,format=raw
qemu-system-aarch64: Invalid SD card size: 14.8 GiB
SD card size has to be a power of 2, e.g. 16 GiB.
You can resize disk images with 'qemu-img resize <imagefile> <new-size>'
(note that this will lose data if you make the image smaller than it currently
is).
--------------------------------------------------
The same invocation with a dump of the actual image
resized to match qemu's odd expectations works fine.
This is on QEMU 5.2.0, as evidenced by the following:
--------------------------------------------------
# qemu-system-aarch64 -version
QEMU emulator version 5.2.0
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
--------------------------------------------------
Is there a simple workaround that disables this rather
arbitrary constraint?
** Affects: qemu
Importance: Undecided
Status: New
--
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https://bugs.launchpad.net/bugs/1910586
Title:
SD card size constraint conceptually wrong
Status in QEMU:
New
Bug description:
The patch discussed here:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg720833.html
introduces an artificial size constraint for SD cards
that has no relation to reality.
I'm trying to use an _actual_ **physical** SD card,
and qemu tells me its size is "invalid".
Something here appears to be conceptually wrong.
--------------------------------------------------
# fdisk -l /dev/sdg
Disk /dev/sdg: 14.84 GiB, 15931539456 bytes, 31116288 sectors
Disk model: USB SD Reader
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x7a0c8bb0
Device Boot Start End Sectors Size Id Type
/dev/sdg1 2048 524287 522240 255M c W95 FAT32 (LBA)
/dev/sdg2 524288 31116287 30592000 14.6G 83 Linux
# qemu-system-aarch64 -M raspi3 -m 1G -kernel vmlinuz-5.4.79-v8 -dtb
bcm2837-rpi-3-b-plus.dtb -append console=ttyAMA0\ root=/dev/mmcblk0p2\ rw
-nographic -serial mon:stdio -drive file=/dev/sdg,format=raw
qemu-system-aarch64: Invalid SD card size: 14.8 GiB
SD card size has to be a power of 2, e.g. 16 GiB.
You can resize disk images with 'qemu-img resize <imagefile> <new-size>'
(note that this will lose data if you make the image smaller than it
currently is).
--------------------------------------------------
The same invocation with a dump of the actual image
resized to match qemu's odd expectations works fine.
This is on QEMU 5.2.0, as evidenced by the following:
--------------------------------------------------
# qemu-system-aarch64 -version
QEMU emulator version 5.2.0
Copyright (c) 2003-2020 Fabrice Bellard and the QEMU Project developers
--------------------------------------------------
Is there a simple workaround that disables this rather
arbitrary constraint?
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