R: Serial console on board based on Lite5200b

From: Angelo <s104259@yahoo•it>
To: linuxppc-embedded@ozlabs•org
Subject: R: Serial console on board based on Lite5200b
Date: Thu, 13 Nov 2008 22:12:41 +0000 (GMT)	[thread overview]
Message-ID: <335718.75634.qm@web23105.mail.ird.yahoo.com> (raw)
In-Reply-To: <31090.73221.qm@web23104.mail.ird.yahoo.com>

Ok i solved my problems, but ...

The file /driver/serial/mpc52xx_uart.c in function mpc52xx_uart_of_enumerat=
e(void) try to keep find the device number with:
...
/* Is a particular device number requested? */
devno =3D get_property(np, "port-number", NULL);
...

I set the device tree in order to use PSC4 in uart mode enabling:
serial@2600 {=09// PSC4
=09device_type =3D "serial";
=09compatible =3D "mpc5200b-psc-uart\0mpc5200-psc-uart";
=09port-number =3D <3>; // Logical port assignment=09=09=09
=09cell-index =3D <3>;
=09reg =3D <2600 100>;
=09interrupts =3D <2 b 0>;
=09interrupt-parent =3D <&mpc5200_pic>;
};

But port-number =3D <3> seems less!
Any idea??

--- Ven 7/11/08, Angelo <s104259@yahoo•it> ha scritto:

> Da: Angelo <s104259@yahoo•it>
> Oggetto: Serial console on board based on Lite5200b
> A: linuxppc-embedded@ozlabs•org
> Data: Venerd=EC 7 novembre 2008, 13:10
> Hi, I have a board based on the Lite5200b, except that the
> serial console is on PSC4 instead of PSC1.=20
>=20
> Using the a custom U-boot (1.2.0) and kernel 2.6.21
> (compiled for powerpc), I managed to get U-boot to output on
> the console on PSC4, but the kernel
> does not.
>=20
> I had just modified lite5200b.dts in some points:
>=20
> 1- My memory is 128Mb
> 2- I don't need eth,mdio,ata so I had commented
> 3- Enable PSC4
> 4- Added the chosen node:
>=20
> chosen {
>       linux,stdout-path =3D
> "/soc5200@f0000000/serial@2600";
>       bootargs =3D "console=3DttyPSC4,115200";=20
> };
>=20
> Debugging my board i notified that u-boot read & modify
> the device tree blob adding the chosen node:
> chosen{                                                   =20
>               =20
>   name =3D "chosen";                              =20
>                        =20
>   bootargs =3D "console=3DttyPSC3";
>   linux,platform =3D <600>;
>   linux,initrd-start =3D <7e2e000>;
>   linux,initrd-end =3D <7f0fbf2>;
>   linux,stdout-path =3D
> "/soc5200@f0000000/serial@2600";
> };=20
>=20
> I follow step by step the kernel start procedure.. and I
> notify that in setup_arch funtion is called
> find_legacy_serial_ports, but when is done
> if(legacy_serial_console >=3D 0)=20
> legacy_serial_console is equal to -1.
>=20
> However, it is not sufficient.  What am I missing?
>=20
> Thank you!
>=20
>=20
>=20
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