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[POWERPC] Autodetect serial console on efika
Efika boards have to be booted with console=ttyPSC0 unless there is a graphics card plugged in. Detect if the firmware stdout is the serial connector. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
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1 changed files with 26 additions and 0 deletions
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@ -21,6 +21,7 @@
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#include <linux/initrd.h>
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#include <linux/timer.h>
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#include <linux/pci.h>
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#include <linux/console.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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@ -221,12 +222,37 @@ static int __init efika_probe(void)
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return 1;
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}
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static void __init efika_init_early(void)
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{
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#ifdef CONFIG_SERIAL_MPC52xx
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struct device_node *stdout_node;
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const char *device_type;
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if (strstr(cmd_line, "console="))
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return;
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/* find the boot console from /chosen/stdout */
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if (!of_chosen)
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return;
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device_type = get_property(of_chosen, "linux,stdout-path", NULL);
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if (!device_type)
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return;
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stdout_node = of_find_node_by_path(device_type);
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if (stdout_node) {
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device_type = get_property(stdout_node, "device_type", NULL);
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if (device_type && strcmp(device_type, "serial") == 0)
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add_preferred_console("ttyPSC", 0, NULL);
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of_node_put(stdout_node);
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}
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#endif
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}
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define_machine(efika)
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{
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.name = EFIKA_PLATFORM_NAME,
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.probe = efika_probe,
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.setup_arch = efika_setup_arch,
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.init = mpc52xx_declare_of_platform_devices,
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.init_early = efika_init_early,
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.show_cpuinfo = efika_show_cpuinfo,
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.init_IRQ = mpc52xx_init_irq,
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.get_irq = mpc52xx_get_irq,
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