xref: /openbmc/u-boot/doc/README.spear (revision d978780b)

SPEAr (Structured Processor Enhanced Architecture).

SPEAr600 is also known as SPEArPlus and SPEAr300 is also known as SPEArBasic

The SPEAr SoC family embeds a customizable logic that can be programmed
one-time by a customer at silicon mask level (i.e. not at runtime!).

U-Boot supports four SoCs: SPEAr600, SPEAr3xx

All 4 SoCs (SPEAr3xx and SPEAr600) share common peripherals. SPEAr300 and
SPEAr600 do not have EMI.

1. ARM926ejs core based (sp600 has two cores, the 2nd handled only in Linux)
2. FastEthernet (sp600 has Gbit version, but same controller - GMAC)
3. USB Host
4. USB Device
5. NAND controller (FSMC)
6. Serial NOR ctrl
7. I2C
8. SPI
9. CLCD
10. others ..

Everything is supported in Linux.
u-boot is currently not supporting all peripeharls (just a few as listed below).
1. USB Device
2. NAND controller (FSMC)
3. Serial Memory Interface
4. EMI (Parallel NOR interface)
4. I2C
5. UART

Build options
	make spear320_config
		spear320 build with environment variables placed at default
		location i.e. Serial NOR device
	make spear320_pnor_config
		This option generates a uboot image that supports emi controller
		for CFI compliant parallel NOR flash. Environment variables are
		placed in Parallel NOR device
	make spear320_nand_config
		spear320 build with environment variables placed in NAND device
	make spear320_usbtty_config
		spear320 build with usbtty terminal as default and environment
		placed at default location
	make spear320_usbtty_pnor_config
		spear320 build with usbtty terminal as default and environment
		placed in pnor device
	make spear320_usbtty_nand_config
		Build with usbtty terminal as default and environment placed in
		NAND device
	make spear300_config
	make spear300_nand_config
	make spear300_usbtty_config
	make spear300_usbtty_nand_config
	make spear310_config
	make spear310_pnor_config
	make spear310_nand_config
	make spear310_usbtty_config
	make spear310_usbtty_pnor_config
	make spear310_usbtty_nand_config
	make spear600_config
	make spear600_nand_config
	make spear600_usbtty_config
	make spear600_usbtty_nand_config

Mac id storage and retrieval in spear platforms

Please read doc/README.enetaddr for the implementation guidelines for mac id
usage. Basically, environment has precedence over board specific storage. The
ethaddr beeing used for the network interface is always taken only from
environment variables. Although, we can check the mac id programmed in i2c
memory by using chip_config command