ARM64 – Pi3 Still Very Unstable..
I have tried the latest 4.7-next patched kernel, from https://github.com/anholt/linux/tree/bcm2837-64-next
After some trials, I did manage to – just – get it to boot – after falling to an ’emergency console’, but the system is very unstable, with multiple recurring MMC errors..
..... Give root password for maintenance (or press Control-D to continue): Error getting authority: Error initializing authority: Could not connect: No such file or directory (g-io-error-quark, 1) [ 714.545569] mmc0: Timeout waiting for hardware interrupt. [ 715.484762] mmcblk0: error -110 transferring data, sector 1026056, nr 16, cmd response 0x900, card status 0xc00 ......... Fedora 24 (Twenty Four) Kernel 4.7.0-rc3-next-20160615 on an aarch64 (ttyS0) ..................
There appear to be two mmc drivers for the PI3 in the selection..
‘SDHCI platform support for the BCM2835 SD/MMC Controller‘
and
‘SDHCI support for the BCM2835 & iProc SD/MMC Controller‘
Selecting _both_ results in kernel boot with multiple mmc errors, and completes eventually, but is not stable..
Selecting just ‘SDHCI platform support for the BCM2835 SD/MMC Controller‘ gives boot fail with multiple repeating MMC errors..
........ [ 21.995425] Waiting for root device /dev/mmcblk0p2... [ 22.787918] mmc0: problem reading SD Status register [ 22.923726] mmc0: error -84 whilst initialising SD card [ 27.649114] mmc0: error -84 whilst initialising SD card [ 32.397154] mmc0: error -84 whilst initialising SD card [ 37.129422] mmc0: error -84 whilst initialising SD card [ 41.861163] mmc0: error -84 whilst initialising SD card [ 46.581532] mmc0: error -84 whilst initialising SD card [ 51.313549] mmc0: error -84 whilst initialising SD card << repeated...>>
Selecting just ‘SDHCI support for the BCM2835 & iProc SD/MMC Controller‘ gives partial boot after an emergency console, but then repeated write failures…
[ 2314.922231] systemd-journald[925]: Failed to write entry (27 items, 745 bytes), ignoring: Read-only file system [ 2315.139570] systemd-journald[925]: Failed to write entry (27 items, 749 bytes), ignoring: Read-only file system [ 2315.359321] systemd-journald[925]: Failed to write entry (27 items, 750 bytes), ignoring: Read-only file system [ 2315.577424] systemd-journald[925]: Failed to write entry (20 items, 618 bytes), ignoring: Read-only file system << repeated...>>
I returned to the relatively-stable 4.5.0+ kernel, but even this tombstones every so often, and usually has to be booted via the emergency console..
So – for the time being – I will wait until a more stable patched kernel is available..
Robert Gadsdon. June 20, 2016.
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