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https://github.com/smaeul/u-boot.git
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2a3bbced71
Replace SPI-NOR by default boot source location as bug is not SPI-NOR related. Signed-off-by: Pali Rohár <pali@kernel.org>
199 lines
6.3 KiB
Groff
199 lines
6.3 KiB
Groff
.TH KWBOOT 1 "2022-03-02"
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.SH NAME
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kwboot \- Boot Marvell Kirkwood (and others 32-bit) SoCs over a serial link.
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.SH SYNOPSIS
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.B kwboot
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.RB [ "-b \fIimage\fP" ]
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.RB [ "-t" ]
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.RB [ "-B \fIbaudrate\fP" ]
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.RB \fITTY\fP
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.SH "DESCRIPTION"
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The \fBkwboot\fP program boots boards based on Marvell's 32-bit
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platforms including Kirkwood, Dove, Avanta, A370, AXP, A375, A38x
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and A39x over their integrated UART. Boot image files will typically
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contain a second stage boot loader, such as U-Boot. The image file
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must conform to Marvell's BootROM firmware image format
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(\fIkwbimage v0\fP or \fIv1\fP), created using a tool such as
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\fBmkimage\fP.
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Following power-up or a system reset, system BootROM code polls the
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UART for a brief period of time, sensing a handshake message which
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initiates an image upload. This program sends this boot message until
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it receives a positive acknowledgement. The image is transferred using
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Xmodem.
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Additionally, this program implements a minimal terminal mode, which
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can be used either standalone, or entered immediately following boot
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image transfer completion. This is often useful to catch early boot
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messages, or to manually interrupt a default boot procedure performed
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by the second-stage loader.
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.SH "OPTIONS"
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.TP
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.BI "\-b \fIimage\fP"
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Handshake; then upload file \fIimage\fP over \fITTY\fP.
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Note that for the encapsulated boot code to be executed, \fIimage\fP
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must be of type "UART boot" (0x69). The \fBkwboot\fP program changes
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this type automatically, unless the \fIimage\fP is signed, in which
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case it cannot be changed.
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This mode writes handshake status and upload progress indication to
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stdout. It is possible that \fIimage\fP contains an optional binary
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code in it's header which may also print some output via UART (for
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example U-Boot SPL does this). In such a case, this output is also
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written to stdout after the header is sent.
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.TP
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.B "\-b"
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Do only handshake on \fITTY\fP without uploading any file. File upload
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could be done later via option \fB\-D\fP or via any other Xmodem
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application, like \fBsx\fP(1).
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.TP
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.B "\-d"
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Do special handshake on \fITTY\fP for console debug mode.
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This will instruct BootROM to enter builtin simple console debug mode.
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Should be combined with option \fB\-t\fP.
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To get a BootROM help, type this command followed by ENTER key:
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.RS 1.2i
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.TP
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.B ?
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.RE
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.IP
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Armada 38x BootROM has a bug which cause that BootROM's standard output
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is turned off on UART when default boot source location contains valid boot image. Nevertheless
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BootROM's standard input and BootROM's terminal echo are active and working
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fine. To workaround this BootROM bug with standard output, it is possible
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to manually overwrite BootROM variables stored in SRAM which BootROM use
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for checking if standard output is enabled or not. To enable BootROM
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standard output on UART, type this command followed by ENTER key:
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.RS 1.2i
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.TP
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.B w 0x40034100 1
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.RE
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.TP
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.BI "\-D" " image"
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Upload file \fIimage\fP over \fITTY\fP without initial handshake.
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This method is used primary on Dove platforms, where BootROM does
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not support initial handshake for entering UART upload mode and
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strapping pins (exported via e.g. buttons) are used instead.
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.TP
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.BI "\-p"
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Obsolete. Does nothing.
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In the past, when this option was used, the program patched the header
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in the image prior upload, to "UART boot" type. This is now done by
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default.
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.TP
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.B "\-q"
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Obsolete. Does nothing.
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It is unknown whether it did something in the past.
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.TP
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.BI "\-s" " response-timeout"
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Specify custom response timeout when doing handshake. Default value is 50 ms.
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It is the timeout between sending two consecutive handshake patterns, meaning
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how long to wait for response from BootROM. Affects only option \fB\-b\fP with
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image file and option \fB\-d\fP.
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Option \fB-a\fP specify response timeout suitable for Armada XP BootROM and
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currently it is 1000 ms.
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Some testing showed that specifying 24 ms as response timeout make handshake
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with Armada 385 BootROM more stable.
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.TP
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.BI "\-t"
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Run a terminal program, connecting standard input and output to
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.RB \fITTY\fP.
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If used in combination with \fB\-b\fP, \fB\-D\fP or \fB\-d\fP option,
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terminal mode is entered immediately following a successful image upload
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or successful handshake (if not doing image upload).
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If standard I/O streams connect to a console, this mode will terminate
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after receiving \fBctrl-\e\fP followed by \fBc\fP from console input.
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.TP
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.BI "\-B \fIbaudrate\fP"
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If used in combination with \fB-b\fP, inject into the image header
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code that changes baud rate to \fIbaudrate\fP after uploading image
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header, and code that changes the baud rate back to the default
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(115200 Bd) before executing payload, and also adjust the baud rate
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on \fITTY\fP correspondingly. This can make the upload significantly
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faster.
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If used in combination with \fB-t\fP, adjust the baud rate to
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\fIbaudrate\fP on \fITTY\fP before starting terminal.
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If both \fB-b\fP and \fB-t\fP are used, the baud rate is changed
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back to 115200 after the upload.
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Tested values for \fIbaudrate\fP for Armada 38x include: 115200,
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230400, 460800, 500000, 576000, 921600, 1000000, 1152000, 1500000,
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2000000, 2500000, 3125000, 4000000 and 5200000.
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.SH "EXAMPLES"
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Instruct BootROM to enter boot Xmodem boot mode, send \fIu-boot-with-spl.kwb\fP
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kwbimage file via Xmodem on \fI/dev/ttyUSB0\fP at 115200 Bd and run terminal
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program:
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.IP
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.B kwboot -b u-boot-with-spl.kwb -t /dev/ttyUSB0
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.PP
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Instruct BootROM to enter boot Xmodem boot mode, send header of
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\fIu-boot-with-spl.kwb\fP kwbimage file via Xmodem at 115200 Bd, then instruct
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BootROM to change baudrate to 5200000 Bd, send data part of the kwbimage
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file via Xmodem at high speed, then change baudrate back to 115200 Bd,
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and finally run terminal program:
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.IP
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.B kwboot -b u-boot-with-spl.kwb -B 5200000 -t /dev/ttyUSB0
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.PP
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Only send \fIu-boot-with-spl.kwb\fP kwbimage file via Xmodem on \fI/dev/ttyUSB0\fP
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at 115200 Bd:
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.IP
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.B kwboot -D u-boot-with-spl.kwb /dev/ttyUSB0
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.PP
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Instruct BootROM to enter console debug mode and run terminal program on
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\fI/dev/ttyUSB0\fP at 115200 Bd:
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.IP
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.B kwboot -d -t /dev/ttyUSB0
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.PP
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Only run terminal program on \fI/dev/ttyUSB0\fP at 115200 Bd:
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.IP
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.B kwboot -t /dev/ttyUSB0
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.SH "SEE ALSO"
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.PP
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\fBmkimage\fP(1), \fBsx\fP(1)
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.SH "AUTHORS"
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Daniel Stodden <daniel.stodden@gmail.com>
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.br
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Luka Perkov <luka@openwrt.org>
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.br
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David Purdy <david.c.purdy@gmail.com>
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.br
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Pali Rohár <pali@kernel.org>
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.br
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Marek Behún <kabel@kernel.org>
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