SEGA Dreamcast ���� eCos/RedBoot for Linux/SH �������Υڡ����Ǥ���
| Address | Contents | Description |
|---|---|---|
| 0x8c000000 |
Dreamcast BIOS work area |
This region contains parameter blocks for kernel.
Set by exec just before kernel booting. Boot parameter block at 0x8c001000. Command line string at 0x8c001100. |
| 0x8c010000 |
1ST_READ.BIN eCos+RedBoot |
Loaded from CD-ROM by Dreamcast firmware. |
| 0x8c0????? | ||
| Free area | ||
| 0x8c210000 |
Linux compressed kernel zImage |
Compressed kernel (arch/sh/boot/zImage) is usually located here by the linker. |
| 0x8c2????? | ||
| Free area | ||
| 0x8c400000 | Initial ramdisk image |
If your initrd image is to be loaded at this region,
following boot parameters should be set by exec. INITRD_START: 0x00400000 INITRD_SIZE: 0x00400000 |
| 0x8c800000 | ||
0x8d000000 |
Free area |
�����Ǥ� eCos/RedBoot on Dreamcast �� Linux kernel ��ư���뤿��μ������Ū���������ޤ��� �����˻���Ȥ��Ǥ���褦�ˡ� Dreamcast bootable CD-R ���뤿��� eCos/RedBoot �Х��ʥ�ȡ� ���̤��줿 Linux kernel �� ELF �����Х��ʥꡢzImage ���Ѱդ��Ƥ��ޤ� (vmlinux �� zImage �Ϥɤ��餫����������Ф褤�Ǥ�)��
eCos/RedBoot �Υͥåȥ����ǽ��Ȥ����� �ޤ������Фν�����ɬ�פ�����ޤ��� �ʲ��Υ����Ф�Ʊ���ޥ����ư�����Ƥ��������� ������ TFTP �� Linux kernel �����������ɤǤ���褦�ˤ��Ƥ����Ƥ���������
Dreamcast �� eCos/RedBoot ��ư���ޤ��� ������ BOOTP �����Ф��� IP ���ɥ쥹������Ǥ������ϡ� �ӥǥ��ȥ��ꥢ��ݡ��Ȥ˼��Τ褦�ʵ�ư��å������� RedBoot prompt �����Ϥ���ޤ���
IP: 192.168.0.248, Default server: 192.168.0.254 RedBoot(tm) bootstrap and debug environment - built 04:32:39, May 9 2001 Copyright (C) 2000, 2001, Red Hat, Inc. RAM: 0x8c000000-0x8d000000, 0x8c03bab8-0x8d000000 available RedBoot>
RedBoot �ϥ��ꥢ��ݡ��Ȥʤ��� TCP ��³(telnet dreamcast 9000)�� ���뤳�Ȥ��Ǥ��ޤ��� ��ǰ�ʤ��� Dreamcast �����ܡ��ɤ䥳��ȥ�����ˤ�����Ϥޤ��Ǥ��ޤ��� help ���ޥ�ɤǡ����Ѳ�ǽ�ʥ��ޥ�ɤδ�ñ��������ɽ������ޤ��� �ܤ��������ˡ�� RedBoot �ޥ˥奢�� �Ȥ��Ƥ���������
% telnet dreamcast 9000
Trying 192.168.0.248...
Connected to dreamcast.ta.keshi.org.
Escape character is '^]'.
RedBoot>
RedBoot> help
Manage machine caches
cache [ON | OFF]
Compute a 32bit checksum [POSIX algorithm] for a range of memory
cksum -b <location> -l <length>
Display (hex dump) a range of memory
dump -b <location> [-l <length>]
Execute an image
exec [-b <parameter block addr>]
[-m <mount rdonly flags>]
[-f <ramdisk flags>]
[-r <root device>]
[-l <loader type>]
[-i <initrd start addr>]
[-j <initrd size>]
[-c "kernel command line"]
[<entry point>]
Execute code at a location
go [-w <timeout>] [entry]
Help about help?
help [<topic>]
Load a file
load [-r] [-v] [-d] [-h <host>] [-m {TFTP | xyzMODEM}]
[-b <base_address>] <file_name>
Network connectivity test
ping [-v] [-n <count>] [-l <length>] [-t <timeout>] [-r <rate>]
[-i <IP_addr>] -h <IP_addr>
Reset the system
reset
Display RedBoot version information
version
RedBoot>
load ���ޥ�ɤ�Ȥäơ� �����Ф��鰵�̤��줿 Linux kernel �� Dreamcast �Υ����ž�����ޤ��� ž���ץ��ȥ���ˤ� TFTP �� XMODEM, YMODEM ���Ȥ��ޤ���
ELF �� SREC �Ǥʤ��ե����������Υ�����֤�ľ��ž���������Ȥ��ϡ� load ���ޥ�ɤ� -r, -b ���ץ������ɲä��Ƥ���������RedBoot> load vmlinux Type Offset VirtAddr PhysAddr FileSiz MemSiz Flags Align 00 00000001 00010000 8c210000 8c210000 000adde2 000ba420 00000007 00010000 Entry point is 0x8c210000 RedBoot>
RedBoot> load -r -b 0x8c210000 zImage Raw file loaded 0x8c210000-0x8c2bdde2 RedBoot>
�Ǹ�� exec ���ޥ�ɤ�Ȥä� Linux kernel ��¹Ԥ��ޤ���
RedBoot> exec Now booting linux kernel (entry 0x8c210000) MOUNT_RDONLY : 0x00000000 RAMDISK_FLAGS : 0x00000000 ORIG_ROOT_DEV : 0x00000000 LOADER_TYPE : 0x00000000 INITRD_START : 0x00000000 INITRD_SIZE : 0x00000000 COMMAND LINE : mem=16M console=ttySC1,115200 console=tty0