Hallo.
I had the same problem.
The following patch can help.
diff -pruN paulus-git/drivers/serial/cpm_uart/cpm_uart_core.c
linuxppc-2.6.24-ids8247/drivers/serial/cpm_uart/cpm_uart_core.c
--- paulus-git/drivers/serial/cpm_uart/cpm_uart_core.c 2008-03-28
11:03:32.000000000 +0100
+++ linuxppc-2.6.24-ids8247/drivers/serial/cpm_uart/cpm_uart_core.c
2008-05-07 19:35:21.000000000 +0200
@@ -1350,6 +1349,9 @@ static int __init cpm_uart_console_setup
uart_set_options(port, co, baud, parity, bits, flow);
cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX);
+#ifndef CONFIG_PPC_EARLY_DEBUG_CPM
+ cpm_set_brg(pinfo->brg - 1, baud);
+#endif
return 0;
}
Regards
Sergej.
Am Mittwoch, den 07.05.2008, 01:31 -0700 schrieb Boris Shteinbock:
> Hi.
> I am doing a port from ppc to powerpc ARCH on sbc8260 based board.
> The problem is, that I can't get SMC1 UART to work.
> After SMC console is initialized.
> cpm_uart_console_write() hangs here
>
> /* Wait for transmitter fifo to empty.
> * Ready indicates output is ready, and xmt is doing
> * that, not that it is ready for us to send.
> */
> while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
> ;
>
> I am using dts tree modified from ep8248 port since it is the only one that
> has smc description in it. :
>
>
> [EMAIL PROTECTED] {
> compatible = "fsl,mpc8260-brg",
> "fsl,cpm2-brg",
> "fsl,cpm-brg";
> reg = <119f0 10 115f0 10>;
> clock-frequency = <135000000>;
>
> };
>
> /* Monitor port/SMC1 */
> smc1: [EMAIL PROTECTED] {
> device_type = "serial";
> compatible = "fsl,mpc8260-smc-uart",
> "fsl,cpm2-smc-uart";
> reg = <0x11a80 0x20 0x1100 0x40>;
> interrupts = <4 8>;
> interrupt-parent = <&PIC>;
> fsl,cpm-brg = <1>;
> fsl,cpm-command = <0x1d000000>;
> linux,my-label = "SMC1";
> };
>
> I checked a BRG settings against working u-boot configuration and they are
> the same. Anyway a wrong BRG setting wouldn't hang this loop
>
> So I have a few questions.
> If someone has done sbc8260 dts tree and port to "powerpc" already, I'd be
> very grateful if he can share it with me.
> I couldn't find anything on the internet.
>
> Can someone, also, explain, how "fsl, cpm-command" field works,
> booting-without-of document doesn't provide much information.
> I feel, that just copying this value from ep8248.dts isn't right somehow.
>
> Thank you
>
>
>
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--
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Software-Entwicklung
IDS GmbH
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