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flash/nor/jtagspi: add JTAGSPI driver

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Many FPGA board speak JTAG and have a SPI flash for their bitstream
attached to them. The SPI flash is programmed by first uploading a
proxy bitstream to the FPGA that connects the JTAG interface to the
SPI interface if the IR contains a certain USER instruction. Then the
SPI flash can be erase, written, read directly through the JTAG DR.

The JTAG and SPI signaling is compatible. Such a proxy bitstream only
needs to connect TDO-MISO, TDI-MOSI, TCK-CLK, and the activate the
chip select when the IR contains the special instruction and the JTAG
state machine is in the DR-SHIFT state.

Change-Id: Ibc21d793a83b36fa37e2704966aa5c837c4dd0d2
Signed-off-by: Robert Jordens <jordens@gmail.com>
Reviewed-on: http://openocd.zylin.com/2844
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Robert Jordens
2015-07-01 03:18:46 -06:00
committed by Spencer Oliver
parent 3edcb94186
commit d25355473d
6 changed files with 817 additions and 0 deletions
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2
src/flash/nor/drivers.c
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@@ -59,6 +59,7 @@ extern struct flash_driver nrf51_flash;
extern struct flash_driver mrvlqspi_flash;
extern struct flash_driver psoc4_flash;
extern struct flash_driver sim3x_flash;
extern struct flash_driver jtagspi_flash;
/**
* The list of built-in flash drivers.
@@ -102,6 +103,7 @@ static struct flash_driver *flash_drivers[] = {
&mrvlqspi_flash,
&psoc4_flash,
&sim3x_flash,
&jtagspi_flash,
NULL,
};