[U-Boot] [PATCH 0/4] dm: rpi: Move Raspberry Pi to use driver model

[Stephen Warren]

On 10/21/2014 08:04 PM, Simon Glass wrote:
> Hi Stephen,
> 
> On 20 October 2014 20:23, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> On 10/19/2014 09:14 PM, Simon Glass wrote:
>>> Hi Stephen,
>>>
>>> On 17 October 2014 20:51, Stephen Warren <swarren at wwwdotorg.org> wrote:
>>>> On 09/30/2014 07:41 PM, Stephen Warren wrote:
>>>>> On 09/22/2014 05:30 PM, Simon Glass wrote:
>>>>>> This series adds driver model support to the GPIO and serial drivers used
>>>>>> by Raspberry Pi, and moves Raspberry Pi over to driver model.
>>>>>>
>>>>>> This requires adding driver model support to the pl01x serial driver, and
>>>>>> replacing the bcm2835 GPIO driver with a driver model version (since there
>>>>>> are no longer clients that don't use driver model).
>>>>>>
>>>>>> See u-boot-dm.git branch rpi-working for the tree this is based on.
>>>>>
>>>>> The series,
>>>>> Tested-by: Stephen Warren <swarren at wwwdotorg.org>
>>>>
>>>> Hmm. I take that back. Patch 4 causes a problem, at least when applied
>>>> on top of u-boot/master from today.
>>>>
>>>> Basic serial output works just fine, and I can interact with U-Boot
>>>> without issue. However, when the boot scripts execute and load an
>>>> extlinux.conf, U-Boot hangs. Up to patch 3, everything is fine.
>>>>
>>>> U-Boot 2014.10-00004-g7830ed7 (Oct 17 2014 - 20:47:19)
>>>>
>>>> DRAM:  480 MiB
>>>> WARNING: Caches not enabled
>>>> MMC:   bcm2835_sdhci: 0
>>>> Using default environment
>>>>
>>>> In:    serial
>>>> Out:   lcd
>>>> Err:   lcd
>>>> reading /uEnv.txt
>>>> 24 bytes read in 14 ms (1000 Bytes/s)
>>>> Hit any key to stop autoboot:  0
>>>> switch to partitions #0, OK
>>>> mmc0 is current device
>>>> Scanning mmc 0...
>>>> Found /extlinux/extlinux.conf
>>>> Retrieving file: /extlinux/extlinux.conf
>>>> reading /extlinux/extlinux.conf
>>>> (U-Boot hangs here)
>>>>
>>>
>>> Can you please point me to where I can get an image to try this with?
>>> Also did you check with dm/next? There may be dependent patches,
>>> although the nature of the problem suggests not.
>>
>> I use (a pretty old version of, but I doubt that matters) RPi
>> Foundation's Raspbian image, and compiled the kernel and U-Boot
>> according to:
>>
>> http://elinux.org/index.php?title=RPi_Upstream_Kernel_Compilation&oldid=351104
>>
>> http://elinux.org/RPi_U-Boot
>>
> 
> I installed the Raspbian image but I don't get uImg.txt nor the same
> boot sequence. I am able to boot a kernel though.

The RPi Foundation images boot their kernel directly from their binary
firmware, and hence don't include any U-Boot or U-Boot boot scripts.

I haven't used boot.scr for a while, but this is apparently what's in mine:

load ${devtype} ${devnum}:1 ${kernel_addr_r} /zImage
load ${devtype} ${devnum}:1 ${fdt_addr_r} /${fdtfile}
setenv bootargs "earlyprintk loglevel=8 console=ttyAMA0 console=tty1 \
    verbose rootwait root=/dev/mmcblk0p2 rw"
bootz ${kernel_addr_r} - ${fdt_addr_r}

I use extlinux/extlinux.conf now, with the following content:

TIMEOUT 100
DEFAULT default
MENU TITLE Boot menu

LABEL default
    MENU LABEL Default kernel
    LINUX ../zImage
    FDTDIR ../
    APPEND earlyprintk loglevel=8 console=ttyAMA0 console=tty1 verbose \
        rootwait root=/dev/mmcblk0p2 rw

LABEL fallback
    MENU LABEL Backup kernel
    LINUX ../backup/zImage
    FDTDIR ../backup/
    APPEND earlyprintk loglevel=8 console=ttyAMA0 console=tty1 verbose \
        rootwait root=/dev/mmcblk0p2 rw

(in both cases, the continuation lines are all on one line; I only split
them for email purposes)