RPi3 arm64 port status
Eric Anholt
eric at anholt.net
Wed Mar 23 18:49:56 PDT 2016
I spent most of today working on getting aarch64 working on the
Raspberry Pi 3. Here's what I've got so far:
U-Boot branch mostly based on srwarren's work:
https://github.com/anholt/u-boot/tree/rpi_dev
(Check the commit messages there for necessary config.txt contents)
My linux tree:
https://github.com/anholt/linux/tree/bcm2837-64
Linux is booting to the point of initializing MMC. As of recently, I'm
seeing MMC hangs at boot, and I haven't tracked down what's changed.
I haven't implemented SMP yet. Just like the 2836, the firmware has the
secondaries spinlooping in a little bit of firmware memory, watching a
channel of the the inter-processor mailboxes. When the secondary sees
the channel get a value, it jumps to it. This is the same on the new
64-bit chips, even though the register we're communicating through is
only 32 bits.
So, in my branch I hacked smp_spin_table.c to only writel. I was
thinking I might be able to add a DT parameter (cpu-release-size = <4>?
cpu-release-size-32?) to control using writel vs writeq. However, I'm
getting weird IPIs immediately after:
[ 0.795797] Mountpoint-cache hash table entries: 2048 (order: 2, 16384 bytes)
[ 0.959619] release addr 0x000000004000009c
[ 1.041792] CPU0: Unknown IPI message 0x11
[ 1.121542] CPU0: Unknown IPI message 0x13
[ 1.201522] CPU0: Unknown IPI message 0x16
[ 1.281106] CPU0: Unknown IPI message 0x17
[ 1.361320] CPU0: Unknown IPI message 0x19
[ 1.440721] CPU0: Unknown IPI message 0x1b
[ 1.521121] release addr 0x00000000400000ac
[ 1.603336] CPU0: Unknown IPI message 0x11
[ 1.683298] CPU0: Unknown IPI message 0x13
[ 1.763220] CPU0: Unknown IPI message 0x16
[ 1.842886] CPU0: Unknown IPI message 0x17
[ 1.922792] CPU0: Unknown IPI message 0x19
[ 2.002674] CPU0: Unknown IPI message 0x1b
[ 2.082831] release addr 0x00000000400000bc
[ 2.164807] CPU0: Unknown IPI message 0x11
[ 2.245091] CPU0: Unknown IPI message 0x13
[ 2.325265] CPU0: Unknown IPI message 0x16
[ 2.405086] CPU0: Unknown IPI message 0x17
[ 2.485416] CPU0: Unknown IPI message 0x19
[ 2.565068] CPU0: Unknown IPI message 0x1b
[ 2.645891] ASID allocator initialised with 65536 entries
[ 2.784436] EFI services will not be available.
[ 3.916963] CPU1: failed to come online
[ 5.026662] CPU2: failed to come online
[ 6.136777] CPU3: failed to come online
[ 6.211751] Brought up 1 CPUs
[ 6.269406] SMP: Total of 1 processors activated.
[ 6.361572] CPU: All CPU(s) started at EL2
so something's still broken, but the boot continues.
With MMC drivers disabled, I get to the point of trying NFS root
mounting, except that DWC2 hasn't found the network adapter (there's a
probe of a root hub, then nothing else). Not clear if this is a 64-bit
specific problem or what.
Just thought people might like to know how things are going for aarch64
on the Pi.
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