[PATCH v5 01/44] dt-bindings: clock: Add new bindings for TI Davinci PLL clocks

Thu Jan 11 15:20:39 PST 2018

On 01/11/2018 12:09 PM, Adam Ford wrote:
> On Thu, Jan 11, 2018 at 11:22 AM, David Lechner <david at lechnology.com> wrote:
>> On 01/11/2018 06:45 AM, Adam Ford wrote:
>>>
>>> On Wed, Jan 10, 2018 at 8:50 PM, David Lechner <david at lechnology.com>
>>> wrote:
>>>>
>>>> On 01/10/2018 04:24 PM, Adam Ford wrote:
>>>>>
>>>>>
>>>>>
>>>>> I am available tomorrow to build and test patches against the
>>>>> da850-evm.  I just need to know which version(s) to test.
>>>>
>>>>
>>>>
>>>> Great. As per the cover letter:
>>>>
>>>> You can find a working branch with everything included in the
>>>> "common-clk-v5"
>>>> branch of https://github.com/dlech/ev3dev-kernel.git.
>>>
>>>
>>> I wasn't sure if things had changed after some of the dialog about the
>>> bindings and device tree.
>>
>>
>> Not yet. ;-)
>>
>>>
>>> Here is my log with DEBUG_LL and CONFIG_EARLY_PRINTK set :
>>>
>>> Starting kernel ...
>>>
>>> Uncompressing Linux... done, booting the kernel.
>>> Booting Linux on physical CPU 0x0
>>> Linux version 4.15.0-rc4-g8564e0f (aford at ubuntu16) (gcc version 7.2.0
>>> (Buildroot 2017.11.1-00021-g7b43660)) #2 PREEMPT Thu Jan 11 06:35:29
>>> CST 2018
>>> CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
>>> CPU: VIVT data cache, VIVT instruction cache
>>> OF: fdt: Machine model: DA850/AM1808/OMAP-L138 EVM
>>
>>
>> OK, using device tree...
> 
> Sorry, I thought I was supposed to. I retested using the board file,
> but it also resulted in a hang.
> 
>>
>>
> [snip]
>>
>>
>> If you are getting to this point, you probably don't need DEBUG_LL.
>> It looks like "earlyprint" is not being passed to the command line
>> anyway, so CONFIG_EARLY_PRINTK is not actually doing anything.
>>
>>> brd: module loaded
>>> libphy: Fixed MDIO Bus: probed
>>> davinci_mdio 1e24000.mdio: failed to get device clock
>>> davinci_mdio: probe of 1e24000.mdio failed with error -2
>>
>>
>> It looks like this needs a clock-names property in the device tree.
>> Please make this change and try again:
>>
>> diff --git a/arch/arm/boot/dts/da850.dtsi b/arch/arm/boot/dts/da850.dtsi
>> index 08a9817..fd3e316 100644
>> --- a/arch/arm/boot/dts/da850.dtsi
>> +++ b/arch/arm/boot/dts/da850.dtsi
>> @@ -713,6 +713,7 @@
>>                          #size-cells = <0>;
>>                          reg = <0x224000 0x1000>;
>>                          clocks = <&psc1 5>;
>> +                       clock-names = "fck";
>>                          status = "disabled";
>>                  };
>>                  eth0: ethernet at 220000 {
>>
>>
> [snip]
> 
> I added your copy-names entry to my device tree and we get a login prompt.  :-)
> 
>> I'm not sure why there is an error here. I'm using I2C0 on my board,
>> so I am fairly confident that it is not a problem introduced by this
>> series.
>>
>>> console [netcon0] enabled
>>> netconsole: network logging started
>>> davinci_emac 1e20000.ethernet: incompatible machine/device type for
>>> reading mac address
>>> hctosys: unable to open rtc device (rtc0)
>>>
>>
>> What is normally the next line after this in a working boot?
>>
>> Also please try passing "clk_ignore_unused" to the kernel command line.
> 
> Here is the log.  There seems to be some garbled characters that don't
> seem to appear.  I'm going to double check those against the stock
> kernel.
> 
> 
> Starting kernel ...
> 
> Uncompressing Linux... done, booting the kernel.
> Booting Linux on physical CPU 0x0
> Linux version 4.15.0-rc4-g8564e0f (aford at ubuntu16) (gcc version 7.2.0
> (Buildroot 2017.11.1-00021-g7b43660)) #2 PREEMPT Thu Jan 11 06:35:29
> CST 2018
> CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
> CPU: VIVT data cache, VIVT instruction cache
> OF: fdt: Machine model: DA850/AM1808/OMAP-L138 EVM
> debug: ignoring loglevel setting.
> bootconsole [earlycon0] enabled
> Memory policy: Data cache writethrough
> cma: Reserved 16 MiB at 0xc2c00000
> DaVinci da850/omap-l138 variant 0x0
> On node 0 totalpages: 16384
>    DMA zone: 128 pages used for memmap
>    DMA zone: 0 pages reserved
>    DMA zone: 16384 pages, LIFO batch:3
> random: fast init done
> pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
> pcpu-alloc: [0] 0
> Built 1 zonelists, mobility grouping on.  Total pages: 16256
> Kernel command line: console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw
> rootfstype=ext4 rootwait ignore_loglevel earlyprintk clk_ignore_unused
> Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
> Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
> Memory: 42164K/65536K available (4548K kernel code, 280K rwdata, 1044K
> rodata, 232K init, 143K bss, 6988K reserved, 16384K cma-reserved)
> Virtual kernel memory layout:
>      vector  : 0xffff0000 - 0xffff1000   (   4 kB)
>      fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
>      vmalloc : 0xc4800000 - 0xff800000   ( 944 MB)
>      lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
>      modules : 0xbf000000 - 0xc0000000   (  16 MB)
>        .text : 0x(ptrval) - 0x(ptrval)   (4550 kB)
>        .init : 0x(ptrval) - 0x(ptrval)   ( 232 kB)
>        .data : 0x(ptrval) -&�p`� rval)   Qm^�`} b �      $\����  �! �
>   "V    � ���@ B- d�����}bf ʒf� i�console [ttyS2] enabled
> console [ttyS2] enabled��F 0x(ptrval)   ( 144 kB)
> bootconsole [earlycon0] disabledObjects=0, CP&�p^�-�Mdes=1
> bootconsole [earlycon0] disabledb ʒf� i�a �F    $\����
> brd: module loaded��}  ��B
> libphy: Fixed MDIO Bus: probed               &�p^�-�I
> davinci_mdio 1e24000.mdio: davinci mdio revision 1.5, bus freq 2200000
>    a- R� /^���� ���v at a��.���� ^\�`&�`l��f ����͍Mֈ�� �E ����э�)�)!  �}�y
> ya bK�����  ֈ��
> davinci_mdio 1e24000.mdio: detected phy mask
> fffffffe ��I  ")=M��-�)!iD����mi-��I  �k��
> ���)� r��.��э�i2� �v� �k$^��э�-�-!mD��q} ] �K���� 6m�R�`� q)�M  ���^��
> ��
> libphy: 1e24000.mdio:
> probed&��߉��a I�j�`�a�I���} 2/�p� bv VK,�q� 6M�- � ֈ�� �I ��f��a�I҈��}
> 2 A-!�a-� �K����!aMq- ")=I��-�-!mD��} 2 A-!�a-� �K -� &-=M��-�-!mD�
> davinci_mdio 1e24000.mdio: phy[0]: device 1e24000.mdio:00, driver SMSC
> LAN8710/LAN8720ݕ�� I�Sm��aM�-! &��P-4RhR�
> Ε�-� �K�^t@�
> i2c /dev entries driver
> davinci_mmc 1c40000.mmc: Using DMA, 4-bit mode
> NET: Registered protocol family 10
> Segment Routing with IPv6
> sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> NET: Registered protocol family 17
> Loading compiled-in X.509 certificates
> mmc0: host does not support reading read-only switch, assuming write-enable
> mmc0: new high speed SDHC card at address b368
> mmcblk0: mmc0:b368 00000 3.75 GiB
>   mmcblk0: p1 p2
> pca953x 0-0020: 0-0020 supply vcc not found, using dummy regulator
> pca953x 0-0020: failed reading register
> pca953x: probe of 0-0020 failed with error -121
> console [netcon0] enabled
> netconsole: network logging started
> davinci_emac 1e20000.ethernet: incompatible machine/device type for
> reading mac address
> hctosys: unable to open rtc device (rtc0)
> clk: Not disabling unused clocks
> vbat: disabling
> EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
> VFS: Mounted root (ext4 filesystem) on device 179:2.
> devtmpfs: mounted
> Freeing unused kernel memory: 232K
> This architecture does not have kernel memory protection.
> EXT4-fs (mmcblk0p2): re-mounted. Opts: data=ordered
> Starting logging: OK
> Initializing random number generator... done.
> Starting network: OK
> 
> Welcome to Buildroot
> buildroot login:
> 
> 
>>
> 
> However, I get a reboot failure:
> 
> umount: devtmpfs busy - remounted read-only
> EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
> The system is going down NOW!
> Sent SIGTERM to all processes
> Sent SIGKILL to all processes
> Requesting system reboot
> 
> reboot: Restarting system
> Reboot failed -- System halted
> 

Adam,

Did this reboot issue get resolved?