From: swarren@wwwdotorg•org (Stephen Warren)
To: linux-arm-kernel@lists•infradead.org
Subject: BCM2836 (Raspberry Pi 2) port
Date: Thu, 23 Apr 2015 22:25:08 -0600 [thread overview]
Message-ID: <5539C5A4.5070409@wwwdotorg.org> (raw)
In-Reply-To: <1429639796-2169-1-git-send-email-eric@anholt.net>
On 04/21/2015 12:09 PM, Eric Anholt wrote:
> This is my first submission of a Raspberry Pi 2 port. It can be found
> at https://github.com/anholt/linux/tree/bcm2836
>
> I'm using the 2835 interrupt controller support, without adding the
> checks for ARM local interrupts first. That means no support for IPIs
> (and thus no SMP), no PMU events, and no local timer (I'm using the
> same 2835 peripheral one).
>
> It supports a similar featureset to Pi 1 at this point. Serial and SD
> cards work. Just one CPU supported. USB (ethernet) works if you use
> U-Boot, or my mailbox series
> (https://github.com/anholt/linux/tree/bcm2836-mbox).
I can't quite get this to work. I think what's happening is that U-Boot
is over-writing the location of the code/data that the CPU1..3 pin loop
uses. Do you know what that address is so I can confirm that?
I suspect this because when I load the kernel/DT in U-Boot, or when I
jump to the kernel to boot it, I see lots of extra duplicated characters
on the UART, like all 4 CPUs are booting Linux. For example:
> Hit any key to stop autoboot: 0
> U-Boot> setenv fdt_high fffffff
> U-Boot> boot
> switch to partitions #0, OK
> mmc0 is current device
> Scanning mmc 0:1...
> Found /extlinux/extlinux.conf
> Retrieving file: /extlinux/extlinux.conf
> reading /extlinux/extlinux.conf
> 429 bytes read in 18 ms (22.5 KiB/s)
> Boot menu
> 1: Default kernel
> 2: Backup kernel
> Enter choice: 1
> 1: Default kernel
> Retrieving file: /extlinux/../zImage
> reading /extlinux/../zImage
> 3467376 bytes read in 1996 ms (1.7 MiB/s)
> append: earlyprintk loglevel=8 console=ttyAMA0 console=tty1 verbose rootwait root=/dev/mmcblk0p2 rw
> Retrieving file: /extlinux/../bcm2836-rpi-2-b.dtb
> reading /extlinux/../bcm2836-rpi-2-b.dtb LLLiiinnnuuuxxx.........
>
>
>
>
>
>
> OOOuuuttt ooofff mmmeeemmmooorrryyy wwwhhhiiillleee aaallllllooocccaaatttiiinnnggg ooouuutttpppuuuttt bbbuuuffffffeeerrr
>
> -- System halted4572 bytes read in 33 ms (134.8 KiB/s)
> Kernel image @ 0x1000000 [ 0x000000 - 0x34e870 ]
> ## Flattened Device Tree blob at 02000000
> Booting using the fdt blob at 0x2000000
> Loading Device Tree to 0fffb000, end 0ffff1db ... OK
>
> Starting kernel ...
next prev parent reply other threads:[~2015-04-24 4:25 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-21 18:09 BCM2836 (Raspberry Pi 2) port Eric Anholt
2015-04-21 18:09 ` [PATCH 1/9] dt-bindings: Add root properties for Raspberry Pi 2 Eric Anholt
2015-04-24 4:27 ` Stephen Warren
2015-04-21 18:09 ` [PATCH 2/9] ARM: BCM2835: Split peripheral definitions off to a common include Eric Anholt
2015-04-24 4:28 ` Stephen Warren
2015-04-21 18:09 ` [PATCH 3/9] ARM: Make a copy of the 2835 dts for the 2836 Eric Anholt
2015-04-24 4:35 ` Stephen Warren
2015-04-21 18:09 ` [PATCH 4/9] ARM: Update the device trees for 2836 Eric Anholt
2015-04-24 4:36 ` Stephen Warren
2015-04-21 18:09 ` [PATCH 5/9] ARM: BCM2836: Add io map initialization for bcm2836 Eric Anholt
2015-04-21 18:53 ` Arnd Bergmann
2015-04-21 20:37 ` Eric Anholt
2015-04-21 21:11 ` Arnd Bergmann
2015-04-21 23:02 ` Eric Anholt
2015-04-22 7:22 ` Arnd Bergmann
2015-04-24 7:16 ` Arnd Bergmann
2015-04-21 18:09 ` [PATCH 6/9] ARM: Make a Kconfig option for shared BCM2835/BCM2836 code Eric Anholt
2015-04-21 18:09 ` [PATCH 7/9] ARM: Add Kconfig support for bcm2836 Eric Anholt
2015-04-21 18:59 ` Arnd Bergmann
2015-04-21 20:38 ` Eric Anholt
2015-04-24 3:30 ` Stephen Warren
2015-04-21 18:09 ` [PATCH 8/9] ARM: Add MAINTAINERS for 2836 Eric Anholt
2015-04-24 4:38 ` Stephen Warren
2015-04-24 17:03 ` Eric Anholt
2015-04-21 18:09 ` [PATCH 9/9] ARM: BCM283x: Register fixed clocks for uart in the DT Eric Anholt
2015-04-24 4:44 ` Stephen Warren
2015-04-24 17:06 ` Eric Anholt
2015-04-25 4:23 ` Stephen Warren
2015-04-24 4:25 ` Stephen Warren [this message]
2015-04-24 18:41 ` BCM2836 (Raspberry Pi 2) port Eric Anholt
2015-04-24 18:57 ` Stephen Warren
2015-04-27 17:19 ` Eric Anholt
2015-05-08 16:14 ` Alexander Stein
2015-05-12 2:36 ` Stephen Warren
2015-05-12 15:39 ` Alexander Stein
2015-05-12 16:03 ` Stephen Warren
2015-05-12 17:32 ` Eric Anholt
2015-05-12 22:03 ` Stephen Warren
2015-05-13 17:46 ` Eric Anholt
2015-05-13 18:32 ` Stephen Warren
2015-05-13 18:59 ` Eric Anholt
2015-04-29 2:38 ` Stephen Warren
2015-04-29 3:41 ` Florian Fainelli
2015-05-06 18:51 ` Eric Anholt
2015-05-06 19:05 ` Arnd Bergmann
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