x86: zImage: Pass working device tree data to the kernel

On x86 platforms, U-Boot does not pass Device Tree data to the kernel.
This prevents the kernel from using FDT loaded by U-Boot.

Read the working FDT address from the "fdtaddr" environment variable
and add a copy of the FDT data to the kernel setup_data list.

Signed-off-by: Ivan Gorinov <ivan.gorinov@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: add #include <linux/libfdt.h> to zimage.c to fix build error]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index 90768a99ceb829d82d77bc61db7a947fa6daa27f..6aba61436123fc58774b379c30e3fd5ebab379dc 100644 (file)
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -10,8 +10,11 @@
 #include <asm/video/edid.h>
 
 /* setup data types */
-#define SETUP_NONE                     0
-#define SETUP_E820_EXT                 1
+enum {
+       SETUP_NONE = 0,
+       SETUP_E820_EXT,
+       SETUP_DTB,
+};
 
 /* extensible setup data list node */
 struct setup_data {

diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index 2a82bc83d6cfcb19bc3b2513ae2bdc6920cca123..6af1bf46783b3b7a65f904cf5b18033951a66cae 100644 (file)
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -14,6 +14,7 @@
  */
 
 #include <common.h>
+#include <malloc.h>
 #include <asm/acpi_table.h>
 #include <asm/io.h>
 #include <asm/ptrace.h>
@@ -25,6 +26,7 @@
 #include <asm/arch/timestamp.h>
 #endif
 #include <linux/compiler.h>
+#include <linux/libfdt.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -95,6 +97,38 @@ static int get_boot_protocol(struct setup_header *hdr)
        }
 }
 
+static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
+{
+       int bootproto = get_boot_protocol(hdr);
+       struct setup_data *sd;
+       int size;
+
+       if (bootproto < 0x0209)
+               return -ENOTSUPP;
+
+       if (!fdt_blob)
+               return 0;
+
+       size = fdt_totalsize(fdt_blob);
+       if (size < 0)
+               return -EINVAL;
+
+       size += sizeof(struct setup_data);
+       sd = (struct setup_data *)malloc(size);
+       if (!sd) {
+               printf("Not enough memory for DTB setup data\n");
+               return -ENOMEM;
+       }
+
+       sd->next = hdr->setup_data;
+       sd->type = SETUP_DTB;
+       sd->len = fdt_totalsize(fdt_blob);
+       memcpy(sd->data, fdt_blob, sd->len);
+       hdr->setup_data = (unsigned long)sd;
+
+       return 0;
+}
+
 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
                                ulong *load_addressp)
 {
@@ -261,6 +295,7 @@ int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
                hdr->acpi_rsdp_addr = acpi_get_rsdp_addr();
 #endif
 
+       setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
        setup_video(&setup_base->screen_info);
 
        return 0;