Update linux bootm to support ePAPR client interface

The ePAPR spec has some subtle differences from the current device
tree based boot interface to the powerpc linux kernel. The powerpc
linux kernel currently ignores the differences that ePAPR specifies.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/lib_ppc/bootm.c b/lib_ppc/bootm.c
index cbe5592a94893215d77da2dc71984d11ac15e322..e83c8608221d54eab8666804ca46c3f9a9329485 100644 (file)
--- a/lib_ppc/bootm.c
+++ b/lib_ppc/bootm.c
@@ -80,7 +80,8 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
        ulong   cmd_start, cmd_end, bootmap_base;
        bd_t    *kbd;
        ulong   ep = 0;
-       void    (*kernel)(bd_t *, ulong, ulong, ulong, ulong);
+       void    (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
+                         ulong r7, ulong r8, ulong r9);
        int     ret;
        ulong   of_size = 0;
        struct lmb *lmb = images->lmb;
@@ -166,8 +167,8 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
                puts ("Could not find kernel entry point!\n");
                goto error;
        }
-       kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))ep;
-
+       kernel = (void (*)(bd_t *, ulong, ulong, ulong,
+                          ulong, ulong, ulong))ep;
        /* find ramdisk */
        ret = boot_get_ramdisk (argc, argv, images, IH_ARCH_PPC,
                        &rd_data_start, &rd_data_end);
@@ -282,14 +283,23 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
        if (of_flat_tree) {     /* device tree; boot new style */
                /*
                 * Linux Kernel Parameters (passing device tree):
-                *   r3: pointer to the fdt, followed by the board info data
-                *   r4: physical pointer to the kernel itself
-                *   r5: NULL
-                *   r6: NULL
-                *   r7: NULL
+                *   r3: pointer to the fdt
+                *   r4: 0
+                *   r5: 0
+                *   r6: epapr magic
+                *   r7: size of IMA in bytes
+                *   r8: 0
+                *   r9: 0
                 */
+#if defined(CONFIG_85xx) || defined(CONFIG_440)
+ #define EPAPR_MAGIC   (0x45504150)
+#else
+ #define EPAPR_MAGIC   (0x65504150)
+#endif
+
                debug ("   Booting using OF flat tree...\n");
-               (*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0);
+               (*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
+                          CFG_BOOTMAPSZ, 0, 0);
                /* does not return */
        } else
 #endif
@@ -301,9 +311,12 @@ do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
                 *   r5: initrd_end - unused if r4 is 0
                 *   r6: Start of command line string
                 *   r7: End   of command line string
+                *   r8: 0
+                *   r9: 0
                 */
                debug ("   Booting using board info...\n");
-               (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
+               (*kernel) (kbd, initrd_start, initrd_end,
+                          cmd_start, cmd_end, 0, 0);
                /* does not return */
        }
        return ;