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cpld/virtex2: allow JSTART to be disabled

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This adds an option to disable the use of the JSTART instruction
when loading bitstreams to xilinx fpgas. JSTART apparently prevents
configuration if the startup clock is not set to the jtag clock in
the bitstream.

xc3sprog is omitting JSTART for all devices. Problems with loading a bitstream
that does not have StartupClk:JTAGClk are described here:
http://www.xilinx.com/support/answers/56151.html

Change-Id: I8137c0bae05a8c3c6f8e2611869f70a770d1651d
Signed-off-by: Robert Jordens <jordens@gmail.com>
Reviewed-on: http://openocd.zylin.com/2860
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
This commit is contained in:
Robert Jordens
2015-07-02 23:15:53 -06:00
committed by Spencer Oliver
parent 76586814a5
commit 2d99a0defa
3 changed files with 17 additions and 8 deletions
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16
src/pld/virtex2.c
View File

@@ -159,13 +159,15 @@ static int virtex2_load(struct pld_device *pld_device, const char *filename)
jtag_add_tlr();
virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
if (!(virtex2_info->no_jstart))
virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
jtag_add_runtest(13, TAP_IDLE);
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
if (!(virtex2_info->no_jstart))
virtex2_set_instr(virtex2_info->tap, 0xc); /* JSTART */
jtag_add_runtest(13, TAP_IDLE);
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
virtex2_set_instr(virtex2_info->tap, 0x3f); /* BYPASS */
jtag_execute_queue();
return ERROR_OK;
@@ -212,6 +214,10 @@ PLD_DEVICE_COMMAND_HANDLER(virtex2_pld_device_command)
virtex2_info = malloc(sizeof(struct virtex2_pld_device));
virtex2_info->tap = tap;
virtex2_info->no_jstart = 0;
if (CMD_ARGC >= 3)
COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], virtex2_info->no_jstart);
pld->driver_priv = virtex2_info;
return ERROR_OK;

1
src/pld/virtex2.h
View File

@@ -25,6 +25,7 @@
struct virtex2_pld_device {
struct jtag_tap *tap;
int no_jstart;
};
#endif /* VIRTEX2_H */