Hi Tom,
On 2016-1-15 0:22, Tom Rini wrote:
On Thu, Jan 14, 2016 at 10:31:34AM +0800, Jeffy Chen wrote:
Hi Tom,
On 2016-1-13 23:28, Tom Rini wrote:
On Wed, Jan 13, 2016 at 04:53:19PM +0800, Jeffy Chen wrote:
The android kernel is using appended dtb by default, and store
ramdisk right after kernel & dtb.
So we needs to relocate ramdisk, and use atags to pass params.
Signed-off-by: Jeffy Chen <jeffy.c...@rock-chips.com>
Acked-by: Simon Glass <s...@chromium.org>
---
Changes in v4: None
Changes in v3: None
Changes in v2: None
include/configs/kylin_rk3036.h | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/include/configs/kylin_rk3036.h b/include/configs/kylin_rk3036.h
index b750b26..49997ec 100644
--- a/include/configs/kylin_rk3036.h
+++ b/include/configs/kylin_rk3036.h
@@ -35,6 +35,29 @@
#undef CONFIG_EXTRA_ENV_SETTINGS
#define CONFIG_EXTRA_ENV_SETTINGS \
"partitions=" PARTS_DEFAULT \
+ "mmcdev=0\0" \
+ "mmcpart=5\0" \
+ "loadaddr=" __stringify(CONFIG_SYS_LOAD_ADDR) "\0" \
+
+#define CONFIG_ANDROID_BOOT_IMAGE
+#define CONFIG_SYS_BOOT_RAMDISK_HIGH
This should already be set.
Right, i'll remove it...
+#define CONFIG_SYS_HUSH_PARSER
+
+#undef CONFIG_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND \
+ "mmc dev ${mmcdev}; if mmc rescan; then " \
+ "part start mmc ${mmcdev} ${mmcpart} boot_start;" \
+ "part size mmc ${mmcdev} ${mmcpart} boot_size;" \
+ "mmc read ${loadaddr} ${boot_start} ${boot_size};" \
+ "bootm start ${loadaddr}; bootm ramdisk;" \
+ "bootm prep; bootm go;" \
+ "fi;" \
+
+/* Enable atags */
+#define CONFIG_SYS_BOOTPARAMS_LEN (64*1024)
+#define CONFIG_INITRD_TAG
+#define CONFIG_SETUP_MEMORY_TAGS
+#define CONFIG_CMDLINE_TAG
But I'm confused as to what exactly is going on here. Appended dtb is
not the same as ATAGS. And you shouldn't need to split up bootm like
that. Can you please explain a bit more? Thanks!
The u-boot will pass atags to kernel, and kernel will merge those
atags into the appended dtb(fdt).
The default bootm flow would not pass ramdisk state, but we need it,
so we should add this state into default flow, or just use split
bootm cmds :)
That seems very strange. Is the ramdisk concatenated with the kernel
and dtb as well (and that's why bootm ramdisk somehow finds it but
normal bootm doesn't as you aren't passing in a ramdisk address) ?
Yes, the ramdisk concatenated with the kernel and dtb as
well(u-boot/include/android_image.h: struct andr_img_hdr).
And the normal bootm cmd would find it by parsing andr_img_hdr struct.
But we still need bootm ramdisk state, because it will call
boot_ramdisk_high to relocate ramdisk area :)
I found if not relocate it to somewhere else, it would be corrupted
after kernel's decompressing(during update fdt area).
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