On 8 June 2015 at 10:38, Roy Spliet r.spliet@ultimaker.com wrote:
Hello Michal,
Op 07-06-15 om 18:48 schreef Michal Suchanek:
Hello,
On 5 June 2015 at 13:52, Roy Spliet r.spliet@ultimaker.com wrote:
Based on the default layout of the android image used at least on Olimex Lime
Signed-off-by: Roy Spliet r.spliet@ultimaker.com
include/configs/sunxi-common.h | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index ec28c40..b38f2f5 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -404,8 +404,15 @@ extern int soft_i2c_gpio_scl; #define BOOT_TARGET_DEVICES_USB(func) #endif
+#ifdef CONFIG_NAND +#define BOOT_TARGET_DEVICES_NAND(func) func(NAND, nand , 0) +#else +#define BOOT_TARGET_DEVICES_NAND(func) +#endif
#define BOOT_TARGET_DEVICES(func) \ BOOT_TARGET_DEVICES_MMC(func) \
BOOT_TARGET_DEVICES_NAND(func) \ BOOT_TARGET_DEVICES_SCSI(func) \ BOOT_TARGET_DEVICES_USB(func) \ func(PXE, pxe, na) \@@ -441,6 +448,8 @@ extern int soft_i2c_gpio_scl; MEM_LAYOUT_ENV_SETTINGS \ "fdtfile=" CONFIG_DEFAULT_DEVICE_TREE ".dtb\0" \ "console=ttyS0,115200\0" \
"mtdids=nand0=mtd2\0" \"mtdparts=mtdparts=mtd2:0xffc00000@0x400000(nand0_main)\0" \ BOOTENVFrom what I heard the nand boot partition size should be specified in nand pages rather than bytes because the boot rom loads a fixed number of pages and just uses the start of each page regardless of page size.
Although I believe you have the facts mostly right, they do not apply in this situation. What you are looking for is the partition definition for U-boot. At this point the boot rom (BROM) is no longer active and thus it's inner workings are mostly irrelevant. The NAND partition lay-out for the boards I have seen (various Olimex + Cubietruck..) are as follows: 0-2MB U-Boot-SPL + U-Boot
OK, so 0-2 MB has to be read (at least in part) by brom to load the SPL so it must be in the format brom understands. The part containing the SPL which is read by brom has certain number of pages. The u-boot part can contain whatever we define.
2-4MB U-Boot SPL + U-Boot (for recovery) 4MB+ Main file system
The main filesystem has to be in format suitable for UBIFS. It has to follow u-boot part possibly with some space in between.
If support for non-uniform flash format is not available then there are basically two options:
1) SPL supports brom format and u-boot binary is part of boot partition. SPL can read/write itself and u-boot and u-boot can read/write the main partition
2) SPL and u-boot support the main partition format. While u-boot is written to the boot partition its pages are written in the format suitable for ubifs. This will get hairy when you want to actually write u-boot and SPL.
The problem with counting the partition sizes in bytes is obvious - whatever you do the brom reads predefined number of pages from the start of the nand to load the SPL and unless you know maximum page size of every nand ever made that is compatible with Allwinner brom you cannot tell what is even the maximum size of this part in bytes.
Thanks
Michal