This description covers the MS7709SE01 variant. See the Section called SuperH/SH3(SH77X9) Hitachi Solution Engine 77X9 for instructions for the MS7729SE01 and MS7709SSE0101 variants.
RedBoot uses the COM1 and COM2 serial ports. The default serial port settings are 38400,8,N,1. Ethernet is also supported using the 10-base T connector.
Management of onboard flash is also supported.
The following RedBoot configurations are supported:
The Solution Engine ships with the Hitachi boot monitor in EPROM which allows for initial programming of RedBoot:
Set switch SW4-1 to ON [boot from EPROM]
Connect a serial cable to CN1 (SCI) and power up the board.
After the boot monitor banner, invoke the flash download/program command:
The monitor should now ask for input:
Flash ROM data copy to RAM Please Send A S-format Record
$ cat redboot_SE7709RP_ROM.eprom.srec > /dev/ttyS0
Start Addrs = A1000000 End Addrs = A1xxxxxx Transfer complete
Set switch SW4-1 to OFF [boot from flash] and reboot the board. You should now see the RedBoot banner.
The exec command which allows the loading and execution of Linux kernels is supported for this board (see the Section called Executing Programs from RedBoot in Chapter 2). The exec parameters used for the SE77x9 are:
Parameter block address. This is normally the first page of the kernel image and defaults to 0x8c101000
Start address of initrd image
Size of initrd image
Kernel arguments string
Mount rdonly flags. If set to a non-zero value the root partition will be mounted read-only.
RAM disk flags. Should normally be 0x4000
Root device specification. /dev/ram is 0x0101
Finally the kernel entry address can be specified as an optional argument. The default is 0x8c102000
For the the SE77x9, Linux by default expects to be loaded at 0x8c001000 which conflicts with the data space used by RedBoot. To work around this, either change the CONFIG_MEMORY_START kernel option to a higher address, or use the compressed kernel image and load it at a higher address. For example, setting CONFIG_MEMORY_START to 0x8c100000, the kernel expects to be loaded at address 0x8c101000 with the entry point at 0x8c102000.
RedBoot sets up the following memory map on the SE77x9 board.
Physical Address Range Description ----------------------- ----------- 0x80000000 - 0x803fffff Flash (MBM29LV160) 0x81000000 - 0x813fffff EPROM (M27C800) 0x8c000000 - 0x8dffffff DRAM 0xb0000000 - 0xb03fffff Ethernet (DP83902A) 0xb0800000 - 0xb08fffff 16C552A 0xb1000000 - 0xb100ffff Switches 0xb1800000 - 0xb18fffff LEDs 0xb8000000 - 0xbbffffff PCMCIA (MaruBun)
The ethernet driver uses a hardwired ESA which can, at present, only be changed in CDL.
These shell variables provide the platform-specific information needed for building RedBoot according to the procedure described in Chapter 3:
export TARGET=se77x9 export ARCH_DIR=sh export PLATFORM_DIR=se77x9
The names of configuration files are listed above with the description of the associated modes.