porting linux 2.6.27 to embedded powerpc board
Grant Likely
grant.likely at secretlab.ca
Sat Aug 23 06:04:38 EST 2008
Add the following to the end of your dts file and see what happens:
chosen {
linux,stdout-path = &serial0;
};
On Fri, Aug 22, 2008 at 1:57 PM, Laxmikant Rashinkar
<lk.atwork at yahoo.com> wrote:
> Hi,
>
> my .dts file is called mpc834x_mds.dts. (My processor is MPC8347)
> Here are its contents.
>
> /*
> * MPC8349E MDS Device Tree Source
> *
> * Copyright 2005, 2006 Freescale Semiconductor Inc.
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms of the GNU General Public License as published by the
> * Free Software Foundation; either version 2 of the License, or (at your
> * option) any later version.
> */
>
> /dts-v1/;
>
> / {
> model = "MPC8349EMDS";
> compatible = "MPC8349EMDS", "MPC834xMDS", "MPC83xxMDS";
> #address-cells = <1>;
> #size-cells = <1>;
>
> aliases {
> ethernet0 = &enet0;
> ethernet1 = &enet1;
> serial0 = &serial0;
> serial1 = &serial1;
> pci0 = &pci0;
> pci1 = &pci1;
> };
>
> cpus {
> #address-cells = <1>;
> #size-cells = <0>;
>
> PowerPC,8349 at 0 {
> device_type = "cpu";
> reg = <0x0>;
> d-cache-line-size = <32>;
> i-cache-line-size = <32>;
> d-cache-size = <32768>;
> i-cache-size = <32768>;
> timebase-frequency = <0>; // from bootloader
> bus-frequency = <0>; // from bootloader
> clock-frequency = <0>; // from bootloader
> };
> };
>
> memory {
> device_type = "memory";
> reg = <0x00000000 0x10000000>; // 256MB at 0
> };
>
> bcsr at e2400000 {
> device_type = "board-control";
> reg = <0xe2400000 0x8000>;
> };
>
> soc8349 at e0000000 {
> #address-cells = <1>;
> #size-cells = <1>;
> device_type = "soc";
> compatible = "simple-bus";
> ranges = <0x0 0xe0000000 0x00100000>;
> reg = <0xe0000000 0x00000200>;
> bus-frequency = <0>;
>
> wdt at 200 {
> device_type = "watchdog";
> compatible = "mpc83xx_wdt";
> reg = <0x200 0x100>;
> };
>
> i2c at 3000 {
> #address-cells = <1>;
> #size-cells = <0>;
> cell-index = <0>;
> compatible = "fsl-i2c";
> reg = <0x3000 0x100>;
> interrupts = <14 0x8>;
> interrupt-parent = <&ipic>;
> dfsrr;
>
> rtc at 68 {
> compatible = "dallas,ds1374";
> reg = <0x68>;
> };
> };
>
> i2c at 3100 {
> #address-cells = <1>;
> #size-cells = <0>;
> cell-index = <1>;
> compatible = "fsl-i2c";
> reg = <0x3100 0x100>;
> interrupts = <15 0x8>;
> interrupt-parent = <&ipic>;
> dfsrr;
> };
>
> spi at 7000 {
> cell-index = <0>;
> compatible = "fsl,spi";
> reg = <0x7000 0x1000>;
> interrupts = <16 0x8>;
> interrupt-parent = <&ipic>;
> mode = "cpu";
> };
>
> dma at 82a8 {
> #address-cells = <1>;
> #size-cells = <1>;
> compatible = "fsl,mpc8349-dma", "fsl,elo-dma";
> reg = <0x82a8 4>;
> ranges = <0 0x8100 0x1a8>;
> interrupt-parent = <&ipic>;
> interrupts = <71 8>;
> cell-index = <0>;
> dma-channel at 0 {
> compatible = "fsl,mpc8349-dma-channel",
> "fsl,elo-dma-channel";
> reg = <0 0x80>;
> interrupt-parent = <&ipic>;
> interrupts = <71 8>;
> };
> dma-channel at 80 {
> compatible = "fsl,mpc8349-dma-channel",
> "fsl,elo-dma-channel";
> reg = <0x80 0x80>;
> interrupt-parent = <&ipic>;
> interrupts = <71 8>;
> };
> dma-channel at 100 {
> compatible = "fsl,mpc8349-dma-channel",
> "fsl,elo-dma-channel";
> reg = <0x100 0x80>;
> interrupt-parent = <&ipic>;
> interrupts = <71 8>;
> };
> dma-channel at 180 {
> compatible = "fsl,mpc8349-dma-channel",
> "fsl,elo-dma-channel";
> reg = <0x180 0x28>;
> interrupt-parent = <&ipic>;
> interrupts = <71 8>;
> };
> };
>
> /* phy type (ULPI or SERIAL) are only types supported for
> MPH */
> /* port = 0 or 1 */
> usb at 22000 {
> compatible = "fsl-usb2-mph";
> reg = <0x22000 0x1000>;
> #address-cells = <1>;
> #size-cells = <0>;
> interrupt-parent = <&ipic>;
> interrupts = <39 0x8>;
> phy_type = "ulpi";
> port1;
> };
> /* phy type (ULPI, UTMI, UTMI_WIDE, SERIAL) */
> usb at 23000 {
> compatible = "fsl-usb2-dr";
> reg = <0x23000 0x1000>;
> #address-cells = <1>;
> #size-cells = <0>;
> interrupt-parent = <&ipic>;
> interrupts = <38 0x8>;
> dr_mode = "otg";
> phy_type = "ulpi";
> };
>
> mdio at 24520 {
> #address-cells = <1>;
> #size-cells = <0>;
> compatible = "fsl,gianfar-mdio";
> reg = <0x24520 0x20>;
>
> phy0: ethernet-phy at 0 {
> interrupt-parent = <&ipic>;
> interrupts = <17 0x8>;
> reg = <0x0>;
> device_type = "ethernet-phy";
> };
> phy1: ethernet-phy at 1 {
> interrupt-parent = <&ipic>;
> interrupts = <18 0x8>;
> reg = <0x1>;
> device_type = "ethernet-phy";
> };
> };
>
> enet0: ethernet at 24000 {
> cell-index = <0>;
> device_type = "network";
> model = "TSEC";
> compatible = "gianfar";
> reg = <0x24000 0x1000>;
> local-mac-address = [ 00 00 00 00 00 00 ];
> interrupts = <32 0x8 33 0x8 34 0x8>;
> interrupt-parent = <&ipic>;
> phy-handle = <&phy0>;
> linux,network-index = <0>;
> };
>
> enet1: ethernet at 25000 {
> cell-index = <1>;
> device_type = "network";
> model = "TSEC";
> compatible = "gianfar";
> reg = <0x25000 0x1000>;
> local-mac-address = [ 00 00 00 00 00 00 ];
> interrupts = <35 0x8 36 0x8 37 0x8>;
> interrupt-parent = <&ipic>;
> phy-handle = <&phy1>;
> linux,network-index = <1>;
> };
>
> serial0: serial at 4500 {
> cell-index = <0>;
> device_type = "serial";
> compatible = "ns16550";
> reg = <0x4500 0x100>;
> clock-frequency = <0>;
> interrupts = <9 0x8>;
> interrupt-parent = <&ipic>;
> };
>
> serial1: serial at 4600 {
> cell-index = <1>;
> device_type = "serial";
> compatible = "ns16550";
> reg = <0x4600 0x100>;
> clock-frequency = <0>;
> interrupts = <10 0x8>;
> interrupt-parent = <&ipic>;
> };
>
> crypto at 30000 {
> compatible = "fsl,sec2.0";
> reg = <0x30000 0x10000>;
> interrupts = <11 0x8>;
> interrupt-parent = <&ipic>;
> fsl,num-channels = <4>;
> fsl,channel-fifo-len = <24>;
> fsl,exec-units-mask = <0x7e>;
> fsl,descriptor-types-mask = <0x01010ebf>;
> };
>
> /* IPIC
> * interrupts cell = <intr #, sense>
> * sense values match linux IORESOURCE_IRQ_* defines:
> * sense == 8: Level, low assertion
> * sense == 2: Edge, high-to-low change
> */
> ipic: pic at 700 {
> interrupt-controller;
> #address-cells = <0>;
> #interrupt-cells = <2>;
> reg = <0x700 0x100>;
> device_type = "ipic";
> };
> };
>
> pci0: pci at e0008500 {
> cell-index = <1>;
> interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
> interrupt-map = <
>
> /* IDSEL 0x11 */
> 0x8800 0x0 0x0 0x1 &ipic 20 0x8
> 0x8800 0x0 0x0 0x2 &ipic 21 0x8
> 0x8800 0x0 0x0 0x3 &ipic 22 0x8
> 0x8800 0x0 0x0 0x4 &ipic 23 0x8
>
> /* IDSEL 0x12 */
> 0x9000 0x0 0x0 0x1 &ipic 22 0x8
> 0x9000 0x0 0x0 0x2 &ipic 23 0x8
> 0x9000 0x0 0x0 0x3 &ipic 20 0x8
> 0x9000 0x0 0x0 0x4 &ipic 21 0x8
>
> /* IDSEL 0x13 */
> 0x9800 0x0 0x0 0x1 &ipic 23 0x8
> 0x9800 0x0 0x0 0x2 &ipic 20 0x8
> 0x9800 0x0 0x0 0x3 &ipic 21 0x8
> 0x9800 0x0 0x0 0x4 &ipic 22 0x8
>
> /* IDSEL 0x15 */
> 0xa800 0x0 0x0 0x1 &ipic 20 0x8
> 0xa800 0x0 0x0 0x2 &ipic 21 0x8
> 0xa800 0x0 0x0 0x3 &ipic 22 0x8
> 0xa800 0x0 0x0 0x4 &ipic 23 0x8
>
> /* IDSEL 0x16 */
> 0xb000 0x0 0x0 0x1 &ipic 23 0x8
> 0xb000 0x0 0x0 0x2 &ipic 20 0x8
> 0xb000 0x0 0x0 0x3 &ipic 21 0x8
> 0xb000 0x0 0x0 0x4 &ipic 22 0x8
>
> /* IDSEL 0x17 */
> 0xb800 0x0 0x0 0x1 &ipic 22 0x8
> 0xb800 0x0 0x0 0x2 &ipic 23 0x8
> 0xb800 0x0 0x0 0x3 &ipic 20 0x8
> 0xb800 0x0 0x0 0x4 &ipic 21 0x8
>
> /* IDSEL 0x18 */
> 0xc000 0x0 0x0 0x1 &ipic 21 0x8
> 0xc000 0x0 0x0 0x2 &ipic 22 0x8
> 0xc000 0x0 0x0 0x3 &ipic 23 0x8
> 0xc000 0x0 0x0 0x4 &ipic 20 0x8>;
> interrupt-parent = <&ipic>;
> interrupts = <66 0x8>;
> bus-range = <0 0>;
> ranges = <0x02000000 0x0 0x90000000 0x90000000 0x0
> 0x10000000
> 0x42000000 0x0 0x80000000 0x80000000 0x0
> 0x10000000
> 0x01000000 0x0 0x00000000 0xe2000000 0x0
> 0x00100000>;
> clock-frequency = <66666666>;
> #interrupt-cells = <1>;
> #size-cells = <2>;
> #address-cells = <3>;
> reg = <0xe0008500 0x100>;
> compatible = "fsl,mpc8349-pci";
> device_type = "pci";
> };
>
> pci1: pci at e0008600 {
> cell-index = <2>;
> interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
> interrupt-map = <
>
> /* IDSEL 0x11 */
> 0x8800 0x0 0x0 0x1 &ipic 20 0x8
> 0x8800 0x0 0x0 0x2 &ipic 21 0x8
> 0x8800 0x0 0x0 0x3 &ipic 22 0x8
> 0x8800 0x0 0x0 0x4 &ipic 23 0x8
>
> /* IDSEL 0x12 */
> 0x9000 0x0 0x0 0x1 &ipic 22 0x8
> 0x9000 0x0 0x0 0x2 &ipic 23 0x8
> 0x9000 0x0 0x0 0x3 &ipic 20 0x8
> 0x9000 0x0 0x0 0x4 &ipic 21 0x8
>
> /* IDSEL 0x13 */
> 0x9800 0x0 0x0 0x1 &ipic 23 0x8
> 0x9800 0x0 0x0 0x2 &ipic 20 0x8
> 0x9800 0x0 0x0 0x3 &ipic 21 0x8
> 0x9800 0x0 0x0 0x4 &ipic 22 0x8
>
> /* IDSEL 0x15 */
> 0xa800 0x0 0x0 0x1 &ipic 20 0x8
> 0xa800 0x0 0x0 0x2 &ipic 21 0x8
> 0xa800 0x0 0x0 0x3 &ipic 22 0x8
> 0xa800 0x0 0x0 0x4 &ipic 23 0x8
>
> /* IDSEL 0x16 */
> 0xb000 0x0 0x0 0x1 &ipic 23 0x8
> 0xb000 0x0 0x0 0x2 &ipic 20 0x8
> 0xb000 0x0 0x0 0x3 &ipic 21 0x8
> 0xb000 0x0 0x0 0x4 &ipic 22 0x8
>
> /* IDSEL 0x17 */
> 0xb800 0x0 0x0 0x1 &ipic 22 0x8
> 0xb800 0x0 0x0 0x2 &ipic 23 0x8
> 0xb800 0x0 0x0 0x3 &ipic 20 0x8
> 0xb800 0x0 0x0 0x4 &ipic 21 0x8
>
> /* IDSEL 0x18 */
> 0xc000 0x0 0x0 0x1 &ipic 21 0x8
> 0xc000 0x0 0x0 0x2 &ipic 22 0x8
> 0xc000 0x0 0x0 0x3 &ipic 23 0x8
> 0xc000 0x0 0x0 0x4 &ipic 20 0x8>;
> interrupt-parent = <&ipic>;
> interrupts = <67 0x8>;
> bus-range = <0 0>;
> ranges = <0x02000000 0x0 0xb0000000 0xb0000000 0x0
> 0x10000000
> 0x42000000 0x0 0xa0000000 0xa0000000 0x0
> 0x10000000
> 0x01000000 0x0 0x00000000 0xe2100000 0x0
> 0x00100000>;
> clock-frequency = <66666666>;
> #interrupt-cells = <1>;
> #size-cells = <2>;
> #address-cells = <3>;
> reg = <0xe0008600 0x100>;
> compatible = "fsl,mpc8349-pci";
> device_type = "pci";
> };
> };
>
>
> thanks
> LK
>
>
> ----- Original Message ----
> From: Grant Likely <grant.likely at secretlab.ca>
> To: Laxmikant Rashinkar <lk.atwork at yahoo.com>
> Cc: linuxppc-embedded at ozlabs.org
> Sent: Friday, August 22, 2008 12:45:54 PM
> Subject: Re: porting linux 2.6.27 to embedded powerpc board
>
> On Fri, Aug 22, 2008 at 12:26 PM, Laxmikant Rashinkar
> <lk.atwork at yahoo.com> wrote:
>> Hi,
>>
>> I still haven't gotten anything to work :-(
>>
>> I'm using Uboot 1.1.4 and Linux 2.6.27 but instead of using uImage, I'm
>> using cuImage.<myboard>
>> The args to dtc are as listed by David Jander
>
> Please post you .dts file and the filename you are using for it.
>
> g.
>
>>
>> My cmd line args are:
>> setenv bootargs root=/dev/ram0 init=/rescue rw console=ttyS0,9600
>> ramdisk_size=65536
>>
>> When I attempt to boot my image it just hangs w/o any output. I dearly
>> wish
>> I could get some console output.
>> Here is the actual display from uboot:
>>
>> ## Booting image at 00800000 ...
>> Image Name: Linux-2.6.27-rc2
>> Image Type: PowerPC Linux Kernel Image (gzip compressed)
>> Data Size: 1640425 Bytes = 1.6 MB
>> Load Address: 00400000
>> Entry Point: 0040055c
>> Verifying Checksum ... OK
>> Uncompressing Kernel Image ... OK
>> ## Loading RAMDisk Image at 01000000 ...
>> Image Name: flash_root.ext3.gz
>> Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
>> Data Size: 13450106 Bytes = 12.8 MB
>> Load Address: 00000000
>> Entry Point: 00000000
>> Verifying Checksum ... OK
>> Loading Ramdisk to 0f29d000, end 0ff70b7a ... OK
>>
>> Two questions:
>>
>> 1) the load address and entry point for the kernel (see above) are
>> non-zero.
>> When we load via uImage, they are always zero. Is this normal? dtc has not
>> options to set the load address and entry point.
>>
>> 2) When I build my kernel, I get two warnings. Could these be causing a
>> problem?
>>
>> WARNING: mm/built-in.o(.data+0x8ec): Section mismatch in reference from
>> the
>> variable contig_page_data to the variable .init.data:bootmem_node_data
>> The variable contig_page_data references
>> the variable __initdata bootmem_node_data
>> If the reference is valid then annotate the
>> variable with __init* (see linux/init.h) or name the variable:
>> *driver, *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one,
>> *_console,
>>
>>
>> MODPOST vmlinux.o
>> WARNING: vmlinux.o(.data+0xfe74): Section mismatch in reference from the
>> variable contig_page_data to the variable .init.data:bootmem_node_data
>> The variable contig_page_data references
>> the variable __initdata bootmem_node_data
>> If the reference is valid then annotate the
>> variable with __init* (see linux/init.h) or name the variable:
>> *driver, *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one,
>> *_console,
>>
>> thanks so much for your help.
>>
>> LK
>>
>> ----- Original Message ----
>> From: David Jander <david.jander at protonic.nl>
>> To: linuxppc-embedded at ozlabs.org
>> Cc: Laxmikant Rashinkar <lk.atwork at yahoo.com>
>> Sent: Thursday, August 21, 2008 2:43:45 AM
>> Subject: Re: porting linux 2.6.27 to embedded powerpc board
>>
>> On Thursday 21 August 2008 01:24:46 Laxmikant Rashinkar wrote:
>>> Hi,
>>>
>>> I have an embedded PowerPC (MPC8347) board that works fine with uboot and
>>> Linux 2.6.15.
>>>
>>> I am trying to upgrade the kernel so that it runs on the latest release -
>>> Linux 2.6.27. So far, I have gotten the kernel to compile on my platform,
>>> but of course it does not boot.
>>
>> Well, honestly I don't know where to look for information either (other
>> than
>> the source-code and examples from others), but here is a list with points
>> to
>> look out for (I have just done the same thing as you for a MPC5200B-based
>> board):
>>
>> 1. Upgrade to latest u-boot first (recent git seems to be fine). There
>> have
>> been a lot of changes in u-boot lately about OF and device-tree related
>> things. I suspect you need a fairly recent version of u-boot to go well
>> with
>> the latest kernel. It's also generally a good idea IMHO.
>>
>> 2. I assume you are porting to arch/powerpc (the old arch/ppc you used
>> back
>> in
>> 2.6.15 is obsolete and broken now).
>>
>> 3. Look at other platforms that use the same processor, and pick a simple
>> one
>> as starting point. Look out for the dts (device-tree-source file in
>> arch/powerpc/boot/dts), copy and modify one to reflect your hardware.
>> Recently a lot of changes happend in the kernel, changing device names,
>> obsoleting "device-type" tags, etc..., so some of the current DTS sources
>> included in the kernel might not even work (wrong device name, missing
>> information, wrong use of "device-type", etc...), so watch out for these
>> kind
>> of issues too.
>>
>> 4. Be sure that the device(s) necessary to produce output on your console
>> are
>> correctly placed in the DT. Also make sure that u-boot knows about it
>> (#define OF_STDOUT_PATH... in your u-boot board config file)
>>
>> 5. When compiling the device tree, it may be necessary to add some extra
>> reserved entries to the compiled tree (I am using dtc -p 10240 -R 20,
>> which
>> might be slightly exaggerated), because u-boot may add something to it,
>> and
>> if it can't, linux won't boot.
>>
>> 6. Remember to always specify the "rootfstype=" option on the commandline
>> if
>> booting from anything other than NFS. This was not necessary back in the
>> 2.6.15-times AFAICR.
>>
>> 7. Boot with a device-tree (in u-boot: "bootm $addrofkernel - $addrofdtb",
>> don't forget the dash if you are not using an initrd). If you don't do
>> this,
>> u-boot can't fix your DT, and the kernel probably won't find it either.
>>
>> 8. Be sure to use the correct version of the DTC (DT compiler) for your
>> kernel
>> (the sources are included nowadays, somewhere in arch/powerpc/boot IIRC).
>> The
>> command used to compile, should probably be something like this:
>>
>> $ ./dtc -p 10240 -R 20 -I dts -o myplatform.dtb -O dtb -b 0
>> dts/myplatform.dts
>>
>> Load the resulting .dtb file directly with u-boot (don't make an u-image
>> out
>> of it).
>>
>> That's all I remember right now... hope it helps.
>>
>> Regards,
>>
>> --
>> David Jander
>>
>>
>> _______________________________________________
>> Linuxppc-embedded mailing list
>> Linuxppc-embedded at ozlabs.org
>> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>>
>
>
>
> --
> Grant Likely, B.Sc., P.Eng.
> Secret Lab Technologies Ltd.
>
>
--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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