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Include a fixup machine start function in nas100d-setup.c to handle
the command line and memory setup parameters which are not specifiable
in the boot loader.
TODO: We must check what is actually passed by the stock
RedBoot on the nas100d.
Signed-off-by: John Bowler <jbowler@acm.org>
arch/arm/mach-ixp4xx/nas100d-setup.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
--- linux-ixp4xx.orig/arch/arm/mach-ixp4xx/nas100d-setup.c 2006-03-09 02:13:15.000000000 +0100
+++ linux-ixp4xx/arch/arm/mach-ixp4xx/nas100d-setup.c 2006-03-09 02:13:54.000000000 +0100
@@ -19,6 +19,7 @@
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/flash.h>
+#include <asm/setup.h>
static struct flash_platform_data nas100d_flash_data = {
.map_name = "cfi_probe",
@@ -125,11 +126,43 @@ static void __init nas100d_init(void)
platform_add_devices(nas100d_devices, ARRAY_SIZE(nas100d_devices));
}
+/*
+ * NAS100D bootstrap may pass in parameters, but we zap the mem
+ * settings to be safe (the box always has 64MByte at 0). The
+ * passed in command line can override this default, we prepend
+ * to the config'ed default.
+ *
+ * NOTE: the startup sequence is:
+ * 1) Call the machine fixup
+ * 2) Parse the ATAG list, the ATAG_CMDLINE is copied in
+ * to default_command_line which is the value of *from
+ * 3) Parse the command line in *from (*not*
+ * default_command_line unless they are the same!)
+ *
+ * Setting mi->nr_banks causes (2) to 'squash' (set to ATAG_NONE)
+ * any ATAG_MEM tags, but mem= command line options cause nr_banks
+ * to be reset to 0 (on the first mem=)
+ */
+
+static void __init nas100d_fixup(struct machine_desc *desc,
+ struct tag *tags, char **cmdline, struct meminfo *mi)
+{
+ /* The NAS100D has one bank of 64MByte memory.
+ * 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 = (64*1024*1024);
+ mi->bank[0].node = PHYS_TO_NID(0);
+}
+
MACHINE_START(NAS100D, "Iomega NAS 100d")
/* Maintainer: www.nslu2-linux.org */
.phys_io = IXP4XX_PERIPHERAL_BASE_PHYS,
.io_pg_offst = ((IXP4XX_PERIPHERAL_BASE_VIRT) >> 18) & 0xFFFC,
.boot_params = 0x00000100,
+ .fixup = nas100d_fixup,
.map_io = ixp4xx_map_io,
.init_irq = ixp4xx_init_irq,
.timer = &ixp4xx_timer,
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