[U-Boot] [PATCH V5] BOOT: Add "bootz" command to boot Linux zImage on ARM
Marek Vasut
marex at denx.de
Wed Mar 14 04:47:56 CET 2012
From: Marek Vasut <marek.vasut at gmail.com>
This command boots Linux zImage from where the zImage is loaded to. Passing
initrd and fdt is supported.
Tested on i.MX28 based DENX M28EVK
Tested on PXA270 based Voipac PXA270.
NOTE: This currently only supports ARM, but other architectures can be easily
added by defining bootz_setup().
Signed-off-by: Marek Vasut <marek.vasut at gmail.com>
Cc: Tom Warren <TWarren at nvidia.com>
Cc: albert.u.boot at aribaud.net
Cc: afleming at gmail.com,
Cc: Simon Glass <sjg at chromium.org>,
Cc: Stephen Warren <swarren at nvidia.com>
Cc: Nicolas Pitre <nico at fluxnic.net>
Cc: Wolfgang Denk <wd at denx.de>
Cc: Detlev Zundel <dzu at denx.de>
---
README | 8 +++
arch/arm/lib/bootm.c | 30 ++++++++++
common/cmd_bootm.c | 141 +++++++++++++++++++++++++++++++++++++++++++---
include/config_cmd_all.h | 1 +
4 files changed, 171 insertions(+), 9 deletions(-)
V2: Use CONFIG_BOOTZ_MAX_KERNEL_LMB_SIZE to reserve kernel LMB
V3: Compute the LMB size at runtime (obsoletes V2)
Move shared code to image.c/image.h
Sync with latest U-Boot
V4: Add all this into cmd_bootm. Therefore, this is part of cmd_bootm (basically
it's stripped-down version). Also, separate out arm-specific component into
arm-specific location.
V5: Staticize bootz_setup(), add information into README.
diff --git a/README b/README
index 4021715..b273070 100644
--- a/README
+++ b/README
@@ -3594,6 +3594,7 @@ go - start application at address 'addr'
run - run commands in an environment variable
bootm - boot application image from memory
bootp - boot image via network using BootP/TFTP protocol
+bootz - boot zImage from memory
tftpboot- boot image via network using TFTP protocol
and env variables "ipaddr" and "serverip"
(and eventually "gatewayip")
@@ -4414,6 +4415,13 @@ U-Boot supports the following image types:
useful when you configure U-Boot to use a real shell (hush)
as command interpreter.
+Booting the Linux zImage:
+-------------------------
+
+On some platforms, it's possible to boot Linux zImage. This is done
+using the "bootz" command. The syntax of "bootz" command is the same
+as the syntax of "bootm" command.
+
Standalone HOWTO:
=================
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index afa0093..ec46d76 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -344,3 +344,33 @@ static ulong get_sp(void)
asm("mov %0, sp" : "=r"(ret) : );
return ret;
}
+
+#ifdef CONFIG_CMD_BOOTZ
+
+struct zimage_header {
+ uint32_t code[9];
+ uint32_t zi_magic;
+ uint32_t zi_start;
+ uint32_t zi_end;
+};
+
+#define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818
+
+int bootz_setup(void *image, void **start, void **end)
+{
+ struct zimage_header *zi = (struct zimage_header *)image;
+
+ if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
+ puts("Bad Linux ARM zImage magic!\n");
+ return 1;
+ }
+
+ *start = (void *)zi->zi_start;
+ *end = (void *)zi->zi_end;
+
+ debug("Kernel image @ 0x%08x [ 0x%08x - 0x%08x ]\n",
+ (uint32_t)image, (uint32_t)*start, (uint32_t)*end);
+
+ return 0;
+}
+#endif /* CONFIG_CMD_BOOTZ */
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index d5745b1..4249831 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -169,25 +169,25 @@ void arch_preboot_os(void) __attribute__((weak, alias("__arch_preboot_os")));
#define IH_INITRD_ARCH IH_ARCH_DEFAULT
-static void bootm_start_lmb(void)
-{
#ifdef CONFIG_LMB
+static void boot_start_lmb(bootm_headers_t *images)
+{
ulong mem_start;
phys_size_t mem_size;
- lmb_init(&images.lmb);
+ lmb_init(&images->lmb);
mem_start = getenv_bootm_low();
mem_size = getenv_bootm_size();
- lmb_add(&images.lmb, (phys_addr_t)mem_start, mem_size);
+ lmb_add(&images->lmb, (phys_addr_t)mem_start, mem_size);
- arch_lmb_reserve(&images.lmb);
- board_lmb_reserve(&images.lmb);
+ arch_lmb_reserve(&images->lmb);
+ board_lmb_reserve(&images->lmb);
+}
#else
-# define lmb_reserve(lmb, base, size)
+static inline void boot_start_lmb(bootm_headers_t *images) { }
#endif
-}
static int bootm_start(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
@@ -197,7 +197,7 @@ static int bootm_start(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]
memset((void *)&images, 0, sizeof(images));
images.verify = getenv_yesno("verify");
- bootm_start_lmb();
+ boot_start_lmb(&images);
/* get kernel image header, start address and length */
os_hdr = boot_get_kernel(cmdtp, flag, argc, argv,
@@ -1523,3 +1523,126 @@ static int do_bootm_integrity(int flag, int argc, char * const argv[],
return 1;
}
#endif
+
+#ifdef CONFIG_CMD_BOOTZ
+
+static int __bootz_setup(void *image, void **start, void **end)
+{
+ /* Please define bootz_setup() for your platform */
+
+ puts("Your platform's zImage format isn't supported yet!\n");
+ return -1;
+}
+int bootz_setup(void *image, void **start, void **end)
+ __attribute__((weak, alias("__bootz_setup")));
+
+/*
+ * zImage booting support
+ */
+static int bootz_start(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[], bootm_headers_t *images)
+{
+ int ret;
+ void *zi_start, *zi_end;
+
+ memset(images, 0, sizeof(bootm_headers_t));
+
+ boot_start_lmb(images);
+
+ /* Setup Linux kernel zImage entry point */
+ if (argc < 2) {
+ images->ep = load_addr;
+ debug("* kernel: default image load address = 0x%08lx\n",
+ load_addr);
+ } else {
+ images->ep = simple_strtoul(argv[1], NULL, 16);
+ debug("* kernel: cmdline image address = 0x%08lx\n",
+ images->ep);
+ }
+
+ ret = bootz_setup((void *)images->ep, &zi_start, &zi_end);
+ if (ret != 0)
+ return 1;
+
+ lmb_reserve(&images->lmb, images->ep, zi_end - zi_start);
+
+ /* Find ramdisk */
+ ret = boot_get_ramdisk(argc, argv, images, IH_INITRD_ARCH,
+ &images->rd_start, &images->rd_end);
+ if (ret) {
+ puts("Ramdisk image is corrupt or invalid\n");
+ return 1;
+ }
+
+#if defined(CONFIG_OF_LIBFDT)
+ /* find flattened device tree */
+ ret = boot_get_fdt(flag, argc, argv, images,
+ &images->ft_addr, &images->ft_len);
+ if (ret) {
+ puts("Could not find a valid device tree\n");
+ return 1;
+ }
+
+ set_working_fdt_addr(images->ft_addr);
+#endif
+
+ return 0;
+}
+
+int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ ulong iflag;
+ bootm_headers_t images;
+
+ if (bootz_start(cmdtp, flag, argc, argv, &images))
+ return 1;
+
+ /*
+ * We have reached the point of no return: we are going to
+ * overwrite all exception vector code, so we cannot easily
+ * recover from any failures any more...
+ */
+ iflag = disable_interrupts();
+
+#if defined(CONFIG_CMD_USB)
+ /*
+ * turn off USB to prevent the host controller from writing to the
+ * SDRAM while Linux is booting. This could happen (at least for OHCI
+ * controller), because the HCCA (Host Controller Communication Area)
+ * lies within the SDRAM and the host controller writes continously to
+ * this area (as busmaster!). The HccaFrameNumber is for example
+ * updated every 1 ms within the HCCA structure in SDRAM! For more
+ * details see the OpenHCI specification.
+ */
+ usb_stop();
+#endif
+
+#ifdef CONFIG_SILENT_CONSOLE
+ fixup_silent_linux();
+#endif
+ arch_preboot_os();
+
+ do_bootm_linux(0, argc, argv, &images);
+#ifdef DEBUG
+ puts("\n## Control returned to monitor - resetting...\n");
+#endif
+ do_reset(cmdtp, flag, argc, argv);
+
+ return 1;
+}
+
+U_BOOT_CMD(
+ bootz, CONFIG_SYS_MAXARGS, 1, do_bootz,
+ "boot Linux zImage image from memory",
+ "[addr [initrd] [fdt]]\n - boot Linux zImage stored in memory\n"
+ "\tThe argument 'initrd' is optional and specifies the address\n"
+ "\tof the initrd in memory.\n"
+#if defined(CONFIG_OF_LIBFDT)
+ "\tWhen booting a Linux kernel which requires a flat device-tree\n"
+ "\ta third argument is required which is the address of the\n"
+ "\tdevice-tree blob. To boot that kernel without an initrd image,\n"
+ "\tuse a '-' for the second argument. If you do not pass a third\n"
+ "\ta bd_info struct will be passed instead\n"
+#endif
+);
+#endif /* CONFIG_CMD_BOOTZ */
diff --git a/include/config_cmd_all.h b/include/config_cmd_all.h
index 9716f9c..2c6b829 100644
--- a/include/config_cmd_all.h
+++ b/include/config_cmd_all.h
@@ -20,6 +20,7 @@
#define CONFIG_CMD_BEDBUG /* Include BedBug Debugger */
#define CONFIG_CMD_BMP /* BMP support */
#define CONFIG_CMD_BOOTD /* bootd */
+#define CONFIG_CMD_BOOTZ /* boot zImage */
#define CONFIG_CMD_BSP /* Board Specific functions */
#define CONFIG_CMD_CACHE /* icache, dcache */
#define CONFIG_CMD_CDP /* Cisco Discovery Protocol */
--
1.7.9
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