BORA SOM/BELK-L/Pheripherals/NOR NAND
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NOR and NAND flash[edit | edit source]
 NOR and NAND flash memories cannot be accessed at the same time because they shares some Zynq pins. In U-boot the switching between accesses to NOR and NAND is automatically done by U-boot itself. By default in kernel only NAND flash can be accessed. For NOR support in kernel please contact technical support. |
NOR and NAND flashes are managed as MTD devices.
Generally speaking, NAND flash memory partitions are defined using the kernel command line:
Bora> pri mtdparts mtdparts=mtdparts=pl35x-nand:256K(spl),768K(uboot),256K(env1),256K(env2),6M(fpga),512K(fdt),8M(kernel),-(nand-ubi) Bora>
adding addmisc to the bootargs parameters list.
The kernel dmesg will configure the NAND partitions in the following way:
[ 1.148350] Creating 8 MTD partitions on "pl35x-nand": [ 1.153486] 0x000000000000-0x000000040000 : "spl" [ 1.170502] 0x000000040000-0x000000100000 : "uboot" [ 1.186404] 0x000000100000-0x000000140000 : "env1" [ 1.202301] 0x000000140000-0x000000180000 : "env2" [ 1.218170] 0x000000180000-0x000000780000 : "fpga" [ 1.229456] 0x000000780000-0x000000800000 : "fdt" [ 1.237981] 0x000000800000-0x000001000000 : "kernel" [ 1.244063] 0x000001000000-0x000040000000 : "nand-ubi"
root@bora:~# cat /proc/mtd dev: size erasesize name mtd0: 00040000 00020000 "spl" mtd1: 000c0000 00020000 "uboot" mtd2: 00040000 00020000 "env1" mtd3: 00040000 00020000 "env2" mtd4: 00600000 00020000 "fpga" mtd5: 00080000 00020000 "fdt" mtd6: 00800000 00020000 "kernel" mtd7: 3f000000 00020000 "nand-ubi"
