For some reason I'm unable to track down the right sequence to
initialize my serial ports. (note: my console is working, but
attempts to initialize SCC1 and SCC4 fail). My console has the luxury
of having uboot initialize it and its brg, but SCC1 / SCC4 aren't so
lucky.
A few questions: To use 3 brgs, should I have 1 brg entry and X reg
values or three brg entries in my device tree? what are the third and
fourth reg values of the brg item in the device tree. I'll need 3
separate baud rates on the serial lines. Should I just add code to
initialize the brg's in u-boot or figure out how to get the kernel to
do it?
boot sequence
===========
CPM UART serial mem=e0011a80 pram=e0000000
ttyCPM0 at MMIO 0xe0011a80 (irq = 16) is a CPM UART
CPM UART serial mem=e0011a00 pram=e0008000
CPM uart[1]:init_scc - sup = e0008000
ttyCPM1 at MMIO 0xe0011a00 (irq = 40) is a CPM UART
CPM UART serial mem=e0011a60 pram=e0008300
CPM uart[2]:init_scc - sup = e0008300
ttyCPM2 at MMIO 0xe0011a60 (irq = 43) is a CPM UART
BRG Values after above
=================
brgc1: 0x00000000
brgc2: 0x00000000
brgc3: 0x00000000
brgc4: 0x00000000
brgc5: 0x00000000
brgc6: 0x00000000
brgc7: 0x0001004e
brgc8: 0x00000000
Device Tree:
[EMAIL PROTECTED] {
compatible = "fsl,mpc8272-brg",
"fsl,cpm2-brg",
"fsl,cpm-brg";
reg = <119f0 10 115f0 10>;
};
/* Monitor port/SMC1 */
[EMAIL PROTECTED] {
device_type = "serial";
compatible = "fsl,mpc8248-smc-uart",
"fsl,cpm2-smc-uart";
reg = <11a80 20 0 40>;
interrupts = <4 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <7>;
fsl,cpm-command = <1d000000>;
};
/* "Serial" port/SCC1 */
[EMAIL PROTECTED] {
device_type = "serial";
compatible = "fsl,mpc8248-scc-uart",
"fsl,cpm2-scc-uart";
reg = <11a00 20 8000 100>;
interrupts = <28 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <1>;
fsl,cpm-command = <00800000>;
};
/* "Serial" port/SCC4 */
[EMAIL PROTECTED] {
device_type = "serial";
compatible = "fsl,mpc8248-scc-uart",
"fsl,cpm2-scc-uart";
reg = <11a60 20 8300 100>;
interrupts = <2B 8>;
interrupt-parent = <&PIC>;
fsl,cpm-brg = <4>;
fsl,cpm-command = <0CE00000>;
};
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
