Android support the following boot modes:
- reboot loader
- reboot recovery
It means that we can also switch the system when dual booting in a diffent way.
Ubuntu booting can be installed in a new independent partition named ramfs instead of the Recovery partition.
So here I describe how to add ramfs boot mode for Ubuntu.
Please add all the patches manually as the locations will differ in every SDK.
Adding the boot mode
Linux kernel patch
diff --git a/arch/arm/mach-rockchip/common.c b/arch/arm/mach-rockchip/common.c
index 510e4da..e91fa64 100755
--- a/arch/arm/mach-rockchip/common.c
+++ b/arch/arm/mach-rockchip/common.c
@@ -264,6 +264,9 @@ void rockchip_restart_get_boot_mode(const char *cmd, u32 *flag, u32 *mode)
else if (!strcmp(cmd, "charge")) {
*flag = SYS_LOADER_REBOOT_FLAG + BOOT_CHARGING;
*mode = BOOT_MODE_CHARGE;
+ }else if(!strcmp(cmd, "ramfs")){
+ *flag = SYS_LOADER_REBOOT_FLAG + BOOT_RAMFS;
+ *mode = BOOT_MODE_RAMFS;
}
} else {
if (is_panic)
diff --git a/arch/arm/mach-rockchip/loader.h b/arch/arm/mach-rockchip/loader.h
index bf2cd47..819e277 100644
--- a/arch/arm/mach-rockchip/loader.h
+++ b/arch/arm/mach-rockchip/loader.h
@@ -17,6 +17,7 @@ enum {
BOOT_FASTBOOT, /* enter fast boot mode */
BOOT_SECUREBOOT_DISABLE,
BOOT_CHARGING, /* enter charge mode */
+ BOOT_RAMFS,
BOOT_MAX /* MAX VALID BOOT TYPE.*/
};
diff --git a/include/linux/rockchip/common.h b/include/linux/rockchip/common.h
index 006d52d..0a10625 100644
--- a/include/linux/rockchip/common.h
+++ b/include/linux/rockchip/common.h
@@ -52,6 +52,7 @@ int rockchip_cpu_disable(unsigned int cpu);
#define BOOT_MODE_PANIC 7
#define BOOT_MODE_WATCHDOG 8
#define BOOT_MODE_TSADC 9
+#define BOOT_MODE_RAMFS 10
int rockchip_boot_mode(void);
void __init rockchip_boot_mode_init(u32 flag, u32 mode);
diff --git a/include/uapi/linux/reboot.h b/include/uapi/linux/reboot.h
index 09d056d..28e4c51 100644
--- a/include/uapi/linux/reboot.h
+++ b/include/uapi/linux/reboot.h
@@ -33,6 +33,7 @@
#define LINUX_REBOOT_CMD_RESTART2 0xA1B2C3D4
#define LINUX_REBOOT_CMD_SW_SUSPEND 0xD000FCE2
#define LINUX_REBOOT_CMD_KEXEC 0x45584543
+#define LINUX_REBOOT_CMD_RESTART_RAMFS 0xEEEEEEEE
diff --git a/kernel/sys.c b/kernel/sys.c
index b1a203d..3147ab5 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -505,6 +505,8 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
mutex_lock(&reboot_mutex);
switch (cmd) {
+ case LINUX_REBOOT_CMD_RESTART_RAMFS:
+ kernel_restart("ramfs");
case LINUX_REBOOT_CMD_RESTART:
kernel_restart(NULL);
break;
[b]U-Boot patch
diff --git a/board/rockchip/common/config.h b/board/rockchip/common/config.h
index 37d287a..9347fe0 100755
--- a/board/rockchip/common/config.h
+++ b/board/rockchip/common/config.h
@@ -188,6 +188,7 @@ enum {
BOOT_FASTBOOT,
BOOT_SECUREBOOT_DISABLE,
BOOT_CHARGING,
+ BOOT_RAMFS,
BOOT_MAX /* MAX VALID BOOT TYPE.*/
};
diff --git a/board/rockchip/common/rkboot/fastboot.c b/board/rockchip/common/rkboot/fastboot.c
index 4bb8c28..c3f47f0 100755
--- a/board/rockchip/common/rkboot/fastboot.c
+++ b/board/rockchip/common/rkboot/fastboot.c
@@ -120,6 +120,10 @@ enum fbt_reboot_type board_fbt_get_reboot_type(void)
case BOOT_CHARGING:
frt = FASTBOOT_REBOOT_CHARGE;
break;
+ case BOOT_RAMFS:
+ frt = FASTBOOT_REBOOT_RAMFS;
+ break;
+
default:
printf("unsupport rk boot type %d\n", reboot_mode);
break;
@@ -479,6 +483,12 @@ void board_fbt_preboot(void)
board_fbt_request_start_fastboot();
}
#endif
+ else if (frt == FASTBOOT_REBOOT_RAMFS) {
+ #ifdef CONFIG_CMD_BOOTRK
+ char *const boot_cmd[] = {"bootrk", "ramfs"};
+ do_bootrk(NULL, 0, ARRAY_SIZE(boot_cmd), boot_cmd);
+ #endif
+ }
else {
FBTDBG("\n%s: check misc command.\n", __func__);
/* unknown reboot cause (typically because of a cold boot).
diff --git a/include/fastboot.h b/include/fastboot.h
index 7b8508b..d6b8f1f 100755
--- a/include/fastboot.h
+++ b/include/fastboot.h
@@ -238,6 +238,7 @@ enum fbt_reboot_type {
FASTBOOT_REBOOT_RECOVERY_WIPE_DATA, /* recovery and wipe data */
FASTBOOT_REBOOT_FASTBOOT, /* android fastboot */
FASTBOOT_REBOOT_CHARGE, /* charge */
+ FASTBOOT_REBOOT_RAMFS,
};
Adding the new boot partition
diff --git a/board/rockchip/common/rkboot/fastboot.c b/board/rockchip/common/rkboot/
index f77fa2c..39e4b69 100755
--- a/board/rockchip/common/rkboot/fastboot.c
+++ b/board/rockchip/common/rkboot/fastboot.c
@@ -218,6 +218,10 @@ void board_fbt_boot_failed(const char* boot)
printf("try to start backup\n");
char *const boot_cmd[] = {"bootrk", BACKUP_NAME};
do_bootrk(NULL, 0, ARRAY_SIZE(boot_cmd), boot_cmd);
+ } else if (!memcmp(BACKUP_NAME, boot, sizeof(BACKUP_NAME))) {
+ printf("try to start ramfs\n");
+ char *const boot_cmd[] = {"bootrk", RAMFS_NAME};
+ do_bootrk(NULL, 0, ARRAY_SIZE(boot_cmd), boot_cmd);
}
#endif
printf("try to start rockusb\n");
diff --git a/board/rockchip/common/rkloader/rkimage.h b/board/rockchip/common/rkload
index 812055f..a2d2855 100755
--- a/board/rockchip/common/rkloader/rkimage.h
+++ b/board/rockchip/common/rkloader/rkimage.h
@@ -144,6 +144,7 @@ typedef struct tag_second_loader_hdr
#define RESOURCE_NAME "resource"
#define LOGO_NAME "logo"
#define FACTORY_NAME "factory"
+#define RAMFS_NAME "ramfs"
int rkimage_load_image(rk_boot_img_hdr *hdr, const disk_partition_t *boot_ptn, \
Then also add the ramfs partition to your partition file
Please use your own partition file, this is just an example
CMDLINE: console=ttyS2 root=LABEL=linuxroot rw rootfstype=ext4 init=/sbin/init mtdparts=rk29xxnand:0x00002000@0x00002000(uboot),0x00002000@0x00004000(trust),0x00008000@0x00006000(resource),0x00010000@0x0000E000(ramfs),-@0x0001E000(linuxroot)
Now you can flash the linux-boot.img image to ramfs partition instead of Recovery partition and still keep the Android Recovery or flash TWRP Recovery to it while still dual-booting
Will also need to add ramfs partition info to the first screen of AndroidTool v2.35
I hope Firefly Team will implement this into their next dual-boot firmware to have an extra partition for dual-booting.
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