1. In general , partitions definition in dts file, you can find some example
according to yours device:
grep -r partition
build_dir/target-xxxxxx/linux-xxxxxx/linux-4.xxxx/arch/arm/boot/dts/
2. Or, partitions definition also can be transmit by uboot env, for example:
In u-boot prompt:
setenv bootargs root=/dev/mtdblock6 rootfstype=squashfs,jffs2 noinitrd
earlycon=uart8250,mmio,0x21c0500 console=ttyS0,115200
mtdparts=60000000.nor:1M(rcw),1M(u-boot),1M(u-boot-env),1M(fman),1M(dtb),5M(kernel),54M(rootfs),64M(otherbank),60M@0x400000(firmware)
while kernel bootup, you can see following log:
...
Kernel command line: root=/dev/mtdblock6 rootfstype=squashfs,jffs2 noinitrd
earlycon=uart8250,mmio,0x21c0500 console=ttyS0,115200
mtdparts=60000000.nor:1M(rcw),1M(u-boot),1M(u-boot-env),1M(fman),1M(dtb),5M(kernel),54M(rootfs),64M(otherbank),60M@0x400000(firmware)
...
60000000.nor: Found 1 x16 devices at 0x0 in 16-bit bank. Manufacturer ID
0x000089 Chip ID 0x00227e
...
fsl,ifc-nand 7e800000.nand: IFC NAND device at 0x7e800000, bank 1
...
Find your MTD device name("60000000.nor", "7e800000.nand") then replace it,
also adjust the partitions definition argument.
3. Warning: Don't change those important partitions(uboot, kernel, etc), only
adjust that you can using.
Thanks & Best Regards
Jiang Yutang
-----Original Message-----
From: openwrt-devel [mailto:[email protected]] On Behalf
Of J Mo
Sent: Friday, September 09, 2016 9:15 AM
To: [email protected]; [email protected];
[email protected]
Subject: [OpenWrt-Devel] How to merge/combine more than one mtd partition for
storage?
Hello!
I have a device which has a 256MB SLC NAND flash for storage. It uses a
redundant pair of 64MB UBI partitions. Then it has 108MB of completely unused
non-partitioned space at the end of the NAND.
I would like to combine these partitions so that I can use the combined 236MB
of NAND space.
Any suggestions on how I should do that?Are there any existing examples of
devices which do anything similar?
Basically I want to RAID0 these things.
One of the 64MB partitions is non-continuous with the other two. The
other 64MB partition is right in front of the remaining
unused/unpartitioned area, so we could just combine them in the DTS or
similar.
Here is what the partition table actually looks like:
No.: Name Attributes Start Size ;
REAL-ORDER
0: 0:SBL1 0x0000ffff 0x0 0x40000 256KB
; 1
1: 0:MIBIB 0x0000ffff 0x40000 0x140000 1.4MB
; 2
2: 0:SBL2 0x0000ffff 0x180000 0x140000 1.4MB
; 3
3: 0:SBL3 0x0000ffff 0x2c0000 0x280000 2.4MB
; 4
4: 0:DDRCONFIG 0x0000ffff 0x540000 0x120000 1.2MB
; 5
5: 0:SSD 0x0000ffff 0x660000 0x120000 1.2MB
; 6
6: 0:TZ 0x0000ffff 0x780000 0x280000 2.4MB
; 7
7: 0:RPM 0x0000ffff 0xa00000 0x280000 2.4MB
; 8
8: 0:APPSBL 0x0000ffff 0x53a0000 0x500000 5.2MB
; 14
9: 0:APPSBLENV 0x0000ffff 0x1180000 0x80000 512KB
; 10
10: 0:ART 0x0000ffff 0x1200000 0x140000 1.4MB
; 11
11: rootfs 0x0000ffff 0x58a0000 0x4000000
65MB ; 15
12: 0:BOOTCONFIG 0x0000ffff 0x5340000 0x60000 393KB
; 13
13: 0:APPSBL_1 0x0000ffff 0xc80000 0x500000 5.2MB
; 9
14: rootfs_1 0x0000ffff 0x1340000 0x4000000
65MB ; 12
0x98a0000 to 0xfffffff is apparently unused
APPSBL = u-boot. BOOTCONFIG is very important and can not be moved.
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