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From ca4508b1266109208f62e986b51397ce2788e255 Mon Sep 17 00:00:00 2001
From: Cliff Brake <cbrake@happy.dev.bec-systems.com>
Date: Fri, 20 Jul 2007 19:01:50 -0400
Subject: [PATCH] ramdisk_load
---
arch/arm/mach-pxa/cm-x270.c | 6 ++++++
include/asm-arm/arch-pxa/cm-x270.h | 2 ++
init/initramfs.c | 16 ++++++++++++++++
3 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-pxa/cm-x270.c b/arch/arm/mach-pxa/cm-x270.c
index 88b080d..c6ec489 100644
--- a/arch/arm/mach-pxa/cm-x270.c
+++ b/arch/arm/mach-pxa/cm-x270.c
@@ -308,6 +308,12 @@ static struct map_desc cmx270_io_desc[] __initdata = {
.length = PXA_CS_SIZE,
.type = MT_DEVICE
},
+ [2] = { /* NOR flash */
+ .virtual = CMX270_FLASH_VIRT,
+ .pfn = __phys_to_pfn(PXA_CS0_PHYS),
+ .length = (8<<20), /* up to 8 MByte flash */
+ .type = MT_DEVICE
+ },
};
/*
diff --git a/include/asm-arm/arch-pxa/cm-x270.h b/include/asm-arm/arch-pxa/cm-x270.h
index 24613a5..aad152e 100644
--- a/include/asm-arm/arch-pxa/cm-x270.h
+++ b/include/asm-arm/arch-pxa/cm-x270.h
@@ -20,7 +20,9 @@
#define CMX270_IT8152_VIRT (CMX270_VIRT_BASE)
#define CMX270_IDE104_VIRT (CMX270_IT8152_VIRT + PXA_CS_SIZE)
+#define CMX270_FLASH_VIRT (CMX270_IDE104_VIRT + PXA_CS_SIZE)
+#define CMX270_FLASH_RAMDISK_VIRT (CMX270_FLASH_VIRT + 0x1c0000)
/* GPIO related definitions */
#define GPIO_IT8152_IRQ (22)
diff --git a/init/initramfs.c b/init/initramfs.c
index 00eff7a..0ecd40b 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -7,6 +7,9 @@
#include <linux/string.h>
#include <linux/syscalls.h>
+// HACK for compulab cm-x270
+#include <asm/arch/cm-x270.h>
+
static __initdata char *message;
static void __init error(char *x)
{
@@ -550,7 +553,20 @@ static int __init populate_rootfs(void)
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
#ifdef CONFIG_BLK_DEV_RAM
+
+ /* hack to make initramfs work because the
+ * compulab BL does not zero out the
+ * initrd memory. This only seems to affect loading
+ * initramfs (cpio.gz) archives. Does not seem to
+ * affect ramdisks.
+ */
+ int initrd_size = *(int *)(CMX270_FLASH_RAMDISK_VIRT);
int fd;
+
+ initrd_end = initrd_start + initrd_size;
+ //printk("CLIFF: initrd_start = 0x%x\n", initrd_start);
+ //printk("CLIFF: initrd_end = 0x%x\n", initrd_end);
+
printk(KERN_INFO "checking if image is initramfs...");
err = unpack_to_rootfs((char *)initrd_start,
initrd_end - initrd_start, 1);
--
1.5.1.6
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