[U-Boot] [PATCH] arm: Add Prep subcommand support to bootm
Simon Schwarz
simonschwarzcor at googlemail.com
Mon Aug 29 18:08:13 CEST 2011
Adds prep subcommand to bootm implementation of ARM. When bootm is called with
the subcommand prep the function stops right after ATAGS creation and before
announce_and_cleanup.
This is used in savebp command
Signed-off-by: Simon Schwarz <simonschwarzcor at gmail.com>
----
V2 changes:
nothing
V3 changes:
nothing
changes after slicing this from patch
http://article.gmane.org/gmane.comp.boot-loaders.u-boot/106422:
DEL Prototype declaration - not necessary if reordered
DEL Most #ifdefs - relying on -ffunction-sections and --gc-sections to handle unused
CHG reorganized bootm. powerpc implementation was the model
ADD get_board_serial fake implementation - this is needed if setup_serial_tag
is compiled but the board doesn't support it - tradeoff for removing
#ifdefs
---
arch/arm/lib/bootm.c | 330 +++++++++++++++++++++++++------------------------
1 files changed, 168 insertions(+), 162 deletions(-)
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 802e833..5f112e2 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -1,4 +1,8 @@
-/*
+/* Copyright (C) 2011
+ * Corscience GmbH & Co. KG - Simon Schwarz <schwarz at corscience.de>
+ * - Added prep subcommand support
+ * - Reorganized source - modeled after powerpc version
+ *
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger at sysgo.de>
@@ -32,31 +36,16 @@
DECLARE_GLOBAL_DATA_PTR;
-#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
- defined (CONFIG_CMDLINE_TAG) || \
- defined (CONFIG_INITRD_TAG) || \
- defined (CONFIG_SERIAL_TAG) || \
- defined (CONFIG_REVISION_TAG)
-static void setup_start_tag (bd_t *bd);
-
-# ifdef CONFIG_SETUP_MEMORY_TAGS
-static void setup_memory_tags (bd_t *bd);
-# endif
-static void setup_commandline_tag (bd_t *bd, char *commandline);
-
-# ifdef CONFIG_INITRD_TAG
-static void setup_initrd_tag (bd_t *bd, ulong initrd_start,
- ulong initrd_end);
-# endif
-static void setup_end_tag (bd_t *bd);
-
+static void (*kernel_entry)(int zero, int arch, uint params);
static struct tag *params;
-#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
-static ulong get_sp(void);
-#if defined(CONFIG_OF_LIBFDT)
-static int bootm_linux_fdt(int machid, bootm_headers_t *images);
-#endif
+static ulong get_sp(void)
+{
+ ulong ret;
+
+ asm("mov %0, sp" : "=r"(ret) : );
+ return ret;
+}
void arch_lmb_reserve(struct lmb *lmb)
{
@@ -80,85 +69,6 @@ void arch_lmb_reserve(struct lmb *lmb)
gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
}
-static void announce_and_cleanup(void)
-{
- printf("\nStarting kernel ...\n\n");
-
-#ifdef CONFIG_USB_DEVICE
- {
- extern void udc_disconnect(void);
- udc_disconnect();
- }
-#endif
- cleanup_before_linux();
-}
-
-int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
-{
- bd_t *bd = gd->bd;
- char *s;
- int machid = bd->bi_arch_number;
- void (*kernel_entry)(int zero, int arch, uint params);
-
-#ifdef CONFIG_CMDLINE_TAG
- char *commandline = getenv ("bootargs");
-#endif
-
- if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
- return 1;
-
- s = getenv ("machid");
- if (s) {
- machid = simple_strtoul (s, NULL, 16);
- printf ("Using machid 0x%x from environment\n", machid);
- }
-
- show_boot_progress (15);
-
-#ifdef CONFIG_OF_LIBFDT
- if (images->ft_len)
- return bootm_linux_fdt(machid, images);
-#endif
-
- kernel_entry = (void (*)(int, int, uint))images->ep;
-
- debug ("## Transferring control to Linux (at address %08lx) ...\n",
- (ulong) kernel_entry);
-
-#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
- defined (CONFIG_CMDLINE_TAG) || \
- defined (CONFIG_INITRD_TAG) || \
- defined (CONFIG_SERIAL_TAG) || \
- defined (CONFIG_REVISION_TAG)
- setup_start_tag (bd);
-#ifdef CONFIG_SERIAL_TAG
- setup_serial_tag (¶ms);
-#endif
-#ifdef CONFIG_REVISION_TAG
- setup_revision_tag (¶ms);
-#endif
-#ifdef CONFIG_SETUP_MEMORY_TAGS
- setup_memory_tags (bd);
-#endif
-#ifdef CONFIG_CMDLINE_TAG
- setup_commandline_tag (bd, commandline);
-#endif
-#ifdef CONFIG_INITRD_TAG
- if (images->rd_start && images->rd_end)
- setup_initrd_tag (bd, images->rd_start, images->rd_end);
-#endif
- setup_end_tag(bd);
-#endif
-
- announce_and_cleanup();
-
- kernel_entry(0, machid, bd->bi_boot_params);
- /* does not return */
-
- return 1;
-}
-
-#if defined(CONFIG_OF_LIBFDT)
static int fixup_memory_node(void *blob)
{
bd_t *bd = gd->bd;
@@ -174,54 +84,19 @@ static int fixup_memory_node(void *blob)
return fdt_fixup_memory_banks(blob, start, size, CONFIG_NR_DRAM_BANKS);
}
-static int bootm_linux_fdt(int machid, bootm_headers_t *images)
+static void announce_and_cleanup(void)
{
- ulong rd_len;
- void (*kernel_entry)(int zero, int dt_machid, void *dtblob);
- ulong of_size = images->ft_len;
- char **of_flat_tree = &images->ft_addr;
- ulong *initrd_start = &images->initrd_start;
- ulong *initrd_end = &images->initrd_end;
- struct lmb *lmb = &images->lmb;
- int ret;
-
- kernel_entry = (void (*)(int, int, void *))images->ep;
-
- boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
-
- rd_len = images->rd_end - images->rd_start;
- ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
- initrd_start, initrd_end);
- if (ret)
- return ret;
-
- ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
- if (ret)
- return ret;
-
- debug("## Transferring control to Linux (at address %08lx) ...\n",
- (ulong) kernel_entry);
-
- fdt_chosen(*of_flat_tree, 1);
-
- fixup_memory_node(*of_flat_tree);
-
- fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
-
- announce_and_cleanup();
-
- kernel_entry(0, machid, *of_flat_tree);
- /* does not return */
+ printf("\nStarting kernel ...\n\n");
- return 1;
-}
+#ifdef CONFIG_USB_DEVICE
+ {
+ extern void udc_disconnect(void);
+ udc_disconnect();
+ }
#endif
+ cleanup_before_linux();
+}
-#if defined (CONFIG_SETUP_MEMORY_TAGS) || \
- defined (CONFIG_CMDLINE_TAG) || \
- defined (CONFIG_INITRD_TAG) || \
- defined (CONFIG_SERIAL_TAG) || \
- defined (CONFIG_REVISION_TAG)
static void setup_start_tag (bd_t *bd)
{
params = (struct tag *) bd->bi_boot_params;
@@ -237,7 +112,6 @@ static void setup_start_tag (bd_t *bd)
}
-#ifdef CONFIG_SETUP_MEMORY_TAGS
static void setup_memory_tags (bd_t *bd)
{
int i;
@@ -252,8 +126,6 @@ static void setup_memory_tags (bd_t *bd)
params = tag_next (params);
}
}
-#endif /* CONFIG_SETUP_MEMORY_TAGS */
-
static void setup_commandline_tag (bd_t *bd, char *commandline)
{
@@ -280,8 +152,6 @@ static void setup_commandline_tag (bd_t *bd, char *commandline)
params = tag_next (params);
}
-
-#ifdef CONFIG_INITRD_TAG
static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
{
/* an ATAG_INITRD node tells the kernel where the compressed
@@ -295,9 +165,18 @@ static void setup_initrd_tag (bd_t *bd, ulong initrd_start, ulong initrd_end)
params = tag_next (params);
}
-#endif /* CONFIG_INITRD_TAG */
-#ifdef CONFIG_SERIAL_TAG
+/* This is a workaround - if boards don't implement
+ * get_board_serial */
+__attribute__((weak))
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+ printf("This board does not implement get_board_serial() \
+ but calls it serialnr is filled with junk!\n");
+ serialnr->high = 0xABCDF;
+ serialnr->low = 0xABCDF;
+}
+
void setup_serial_tag (struct tag **tmp)
{
struct tag *params = *tmp;
@@ -312,9 +191,7 @@ void setup_serial_tag (struct tag **tmp)
params = tag_next (params);
*tmp = params;
}
-#endif
-#ifdef CONFIG_REVISION_TAG
void setup_revision_tag(struct tag **in_params)
{
u32 rev = 0;
@@ -326,19 +203,148 @@ void setup_revision_tag(struct tag **in_params)
params->u.revision.rev = rev;
params = tag_next (params);
}
-#endif /* CONFIG_REVISION_TAG */
static void setup_end_tag (bd_t *bd)
{
params->hdr.tag = ATAG_NONE;
params->hdr.size = 0;
}
-#endif /* CONFIG_SETUP_MEMORY_TAGS || CONFIG_CMDLINE_TAG || CONFIG_INITRD_TAG */
-static ulong get_sp(void)
+static void create_atags(bootm_headers_t *images)
{
- ulong ret;
+ bd_t *bd = gd->bd;
+ char *commandline = getenv("bootargs");
- asm("mov %0, sp" : "=r"(ret) : );
- return ret;
+ setup_start_tag(bd);
+#ifdef CONFIG_SERIAL_TAG
+ setup_serial_tag(¶ms);
+#endif
+#ifdef CONFIG_CMDLINE_TAG
+ setup_commandline_tag(gd->bd, commandline);
+#endif
+#ifdef CONFIG_REVISION_TAG
+ setup_revision_tag(¶ms);
+#endif
+#ifdef CONFIG_SETUP_MEMORY_TAGS
+ setup_memory_tags(bd);
+#endif
+#ifdef CONFIG_INITRD_TAG
+ if (images->rd_start && images->rd_end)
+ setup_initrd_tag(bd, images->rd_start, images->rd_end);
+#endif
+ setup_end_tag(bd);
+}
+
+static int create_fdt(bootm_headers_t *images)
+{
+ ulong of_size = images->ft_len;
+ char **of_flat_tree = &images->ft_addr;
+ ulong *initrd_start = &images->initrd_start;
+ ulong *initrd_end = &images->initrd_end;
+ struct lmb *lmb = &images->lmb;
+ ulong rd_len;
+ int ret;
+
+ debug("using: FDT\n");
+
+ boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree);
+
+ rd_len = images->rd_end - images->rd_start;
+ ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
+ initrd_start, initrd_end);
+ if (ret)
+ return ret;
+
+ ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size);
+ if (ret)
+ return ret;
+
+ fdt_chosen(*of_flat_tree, 1);
+ fixup_memory_node(*of_flat_tree);
+ fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
+
+ return 0;
+}
+
+/* Subcommand: CMDLINE */
+static int boot_cmdline_linux(bootm_headers_t *images)
+{
+ return -1; /* not implemented */
+}
+
+/* Subcommand: BDT */
+static int boot_bd_t_linux(bootm_headers_t *images)
+{
+ return -1; /* not implemented */
+}
+
+/* Subcommand: PREP */
+static void boot_prep_linux(bootm_headers_t *images)
+{
+#ifdef CONFIG_OF_LIBFDT
+ if (images->ft_len) {
+ debug("using: FDT\n");
+ if (create_fdt(images)) {
+ printf("FDT creation failed! hanging...");
+ hang();
+ }
+ } else
+#endif
+ {
+#if defined(CONFIG_SETUP_MEMORY_TAGS) || \
+ defined(CONFIG_CMDLINE_TAG) || \
+ defined(CONFIG_INITRD_TAG) || \
+ defined(CONFIG_SERIAL_TAG) || \
+ defined(CONFIG_REVISION_TAG)
+ debug("using: ATAGS\n");
+ create_atags(images);
+#else
+ printf("FDT and ATAGS failed - hanging\n");
+ hang();
+#endif
+ }
+
+ kernel_entry = (void (*)(int, int, uint))images->ep;
+}
+
+/* Subcommand: GO */
+static void boot_jump_linux(bootm_headers_t *images)
+{
+ int machid = gd->bd->bi_arch_number;
+ char *s;
+ s = getenv("machid");
+ if (s) {
+ strict_strtoul(s, 16, (long unsigned int *) &machid);
+ debug("Using machid 0x%x from environment\n", machid);
+ }
+
+ debug("Using machid 0x%x from bd\n", machid);
+ debug("## Transferring control to Linux (at address %08lx)" \
+ "...\n", (ulong) kernel_entry);
+ show_boot_progress(15);
+ announce_and_cleanup();
+ kernel_entry(0, machid, gd->bd->bi_boot_params);
+}
+
+/* Main Entry point for arm bootm implementation
+ *
+ * Modeled after the powerpc implementation
+ * DIFFERENCE: Instead of calling prep and go at the end
+ * they are called if subommand is equal 0.
+ */
+int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
+{
+ if (flag & BOOTM_STATE_OS_CMDLINE)
+ boot_cmdline_linux(images);
+
+ if (flag & BOOTM_STATE_OS_BD_T)
+ boot_bd_t_linux(images);
+
+ if (flag & BOOTM_STATE_OS_PREP || flag == 0)
+ boot_prep_linux(images);
+
+ if (flag & BOOTM_STATE_OS_GO || flag == 0)
+ boot_jump_linux(images);
+
+ return 0;
}
--
1.7.4.1
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