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authorH. Peter Anvin <hpa@zytor.com>2010-02-06 11:24:24 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-06 11:24:24 -0800
commitc823e677c273321821975fa4bd512f7eabf0ce51 (patch)
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sysdump: port memdump to com32 with the intent of enhancing it
Port memdump to com32, with the intent of modifying and enhancing it. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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+This is a very simple COMBOOT program which can be used to dump memory
+regions over a serial port. To use it, type on the SYSLINUX command
+line:
+
+memdump <port> <prefix> <start>,<len> <start>,<len>...
+
+For example:
+
+memdump 0 funnysystem- 0,0x600 0x9fc00,0x400 0xf0000,0x10000
+
+... dumps three memory ranges (the standard BIOS memory ranges, often
+useful) onto serial port 0. The <port> can either be in the range 0-3
+for the standard BIOS serial port, or the I/O address of the UART.
+
+The data is transferred using the YMODEM protocol; the Unix
+implementation of this protocol is called "rb" and is part of the
+"lrzsz" (or "rzsz") package. If one uses a terminal program like
+Minicom, there is often a way to invoke it from inside the terminal
+program; in Minicom, this is done with the Ctrl-A R control sequence.