On Saturday, December 12, 2015 at 07:30:46 AM, Chin Liang See wrote: [...]
Is this the default Altera layout ?
Yah but believe it need to be updated
So you're not worried about compatibility I presume ?
I still need to care of compatiblity. Some of them will break due to size increase. But through the use of partition name and environment, user will be abstracted from this.
OK
+#define MTDPARTS_DEFAULT "mtdparts=ff705000.spi:"\
"256k(spl)," \"64k(env)," \"64k(dtb)," \What happens if the DT grows over 64k ?
Hmmm rethinking of this, I will make Linux dtb, U-Boot and kernel as part of one big UBI partition called boot.
I am using this sort of layout on SoCkit internally: "mtdparts=ff705000.spi:" \
"1m(u-boot)," \ "64k(env1)," \ "64k(env2)," \ "-(UBI)\0"Hmmm I didn't see the area for SPL. Wonder is it part of u-boot partition?
Yes, the u-boot-with-spl-dtb.sfp (which contains 4 copies of SPL and U-Boot image) goes into the 'u-boot' partition.
I have two environment blocks to implement redundant env, which is useful when deploying the system. It makes the system slightly more resilient against problems of aging flash.
Nice thought, will increase the environment partition to 256kB to cater this.
I am using env1 and env2, see above. That should be enough.
"256k(boot)," \256k is not enough for U-Boot (considering this is U-Boot).
Will create boot region to avoid worrying the size issue
"16m(kernel),"\
"16m(rootfs),"\
Why don't you put kernel and rootfs onto the UBI volume instead ?
Yup, kernel will go into boot partition. It will be separated from rootfs as user might choose nfs.
Can you share the final layout before you roll out patches ?
Sure, plan to do so but need to away from desk just now.
Here is the old layout 256k(spl) 64k(env) 64k(dtb) 256k(boot) 16m(kernel) 16m(rootfs)
The new one would like this 256k(spl)
I'd say you should just call this u-boot, see above for the rationale.
256k(env) 15872k(boot) 16m(rootfs)
The boot partition can be used as ubi part or raw partition. It contains the linux dtb, u-boot and linux images.
Is that an UBIFS partition ? If so, why don't you just use two UBI volumes ?
The environment will be used to determine the image offset for mentioned boot images from boot partition.
Thanks Chin Liang