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Include a fixup machine start function in nslu2-setup.c to handle
the command line and memory setup parameters which are not specifiable
in the boot loader.
Signed-off-by: John Bowler <jbowler@acm.org>
--- linux-2.6.15/arch/arm/mach-ixp4xx/nslu2-setup.c 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.15/arch/arm/mach-ixp4xx/nslu2-setup.c 1970-01-01 00:00:00.000000000 +0000
@@ -18,6 +18,8 @@
#include <linux/serial_8250.h>
#include <linux/mtd/mtd.h>
+#include <asm/setup.h>
+#include <asm/memory.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
@@ -165,12 +167,52 @@ static void __init nslu2_init(void)
platform_add_devices(nslu2_devices, ARRAY_SIZE(nslu2_devices));
}
+/*
+ * NSLU2 RedBoot passes garbage atag/parameter values - i.e. r2
+ * on entry is not useable - so we get to set the right values
+ * here...
+ */
+static void __init nslu2_fixup(struct machine_desc *desc,
+ struct tag *tags, char **cmdline, struct meminfo *mi)
+{
+ char saved_command_line[COMMAND_LINE_SIZE];
+ /* Put NSLU2 specific known-required-for-certain stuff here, leave
+ * a trailing space!
+ */
+ static char nslu2_command_line[] =
+ "root=/dev/mtdblock4 rw rootfstype=jffs2 init=/linuxrc "
+ "rtc-x1205.probe=0,0x6f rtc-x1205.hctosys=1 ";
+ const int len = (sizeof nslu2_command_line)-1;
+
+ /* The NSLU2 has one bank of 32MByte memory.
+ * NOTE: this will totally destroy attempts to make fatslugs work,
+ * FATSLUG FATSLUG FATSLUG: please parameterise this!
+ * NOTE: setting nr_banks != 0 causes kernel/setup.c to remove
+ * the mem tags from the tag list. We need do nothing here!
+ */
+ mi->nr_banks=1;
+ mi->bank[0].start = 0;
+ mi->bank[0].size = (32*1024*1024);
+ mi->bank[0].node = PHYS_TO_NID(0);
+
+ /* The tag list is the one from kernel/setup.c, it has no
+ * command line, so we are free to make one up, do this by
+ * prepending to the default command line which has been
+ * passed in (so that can override if necessary).
+ */
+ memcpy(saved_command_line, *cmdline, COMMAND_LINE_SIZE);
+ memcpy(*cmdline, nslu2_command_line, len);
+ memcpy(*cmdline + len, saved_command_line, COMMAND_LINE_SIZE - len);
+ *cmdline[COMMAND_LINE_SIZE-1] = 0;
+}
+
MACHINE_START(NSLU2, "Linksys NSLU2")
/* Maintainer: www.nslu2-linux.org */
.phys_ram = PHYS_OFFSET,
.phys_io = IXP4XX_PERIPHERAL_BASE_PHYS,
.io_pg_offst = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
- .boot_params = 0x00000100,
+ .boot_params = 0, /* because they are garbage */
+ .fixup = nslu2_fixup,
.map_io = ixp4xx_map_io,
.init_irq = ixp4xx_init_irq,
.timer = &ixp4xx_timer,
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