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adi_v5: Fix wrong ap value

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Problem
dap->ap_current is register value, not field value.
it restores invalid ap when it calls dap_ap_select(dap, ap_old) later.

* assume the current ap is 1, dap->ap_current value would be (1 << 24).
ap_old = dap->ap_current;   <-- ap_old = 1<<24 = 0x1000000.
...
dap_ap_select(dap, ap_old); <-- select 0x1000000, not 1.
* All AP registers accessing fail afterwards.

One of the reproducible case(s): CORE residents in AP >= 1
  dap_lookup_cs_component() being used to find PE(*).
  In most cases, PE would be found in AP==0, hence the problem is hidden.
  When AP number is 1, dap->ap_current would have the value of 1<<24.
  Anyone get the AP value with dap->ap_current and resotre it later would
  select the wrong AP and all accessing later would fail.

  The ARM Versatile and/or FPGA would have better chance to provide this
  kind of environment that PE residents in AP>=1. As they have an 'umbrella'
  system at AP0, and main system at AP>=1.

  * PE: Processing Element. AKA Core. See ARM Glossary at
    http://infocenter.arm.com/help/topic/com.arm.doc.aeg0014g/ABCDEFGH.html

Fix
Use dap_ap_get_select() to get ap value.
a. Retrieve current ap value by calling dap_ap_get_select();
     src/flash/nor/kinetis.c
     src/target/arm_adi_v5.c

b. The code is correct (dap->ap_current >> 24), but it's better to use
   dap_ap_get_select() so everything could be synchronized.
     src/flash/nor/sim3x.c

Change-Id: I97b5a13a3fc5506cf287e299c6c35699374de74f
Signed-off-by: Alamy Liu <alamy.liu@gmail.com>
Reviewed-on: http://openocd.zylin.com/2935
Reviewed-by: Andreas Färber <afaerber@suse.de>
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
This commit is contained in:
Alamy Liu
2015-08-11 17:03:57 -07:00
committed by Paul Fertser
parent 4b608d7fea
commit bfba15a898
3 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/target/arm_adi_v5.c
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@@ -844,7 +844,7 @@ int dap_get_debugbase(struct adiv5_dap *dap, int ap,
if (ap >= 256)
return ERROR_COMMAND_SYNTAX_ERROR;
ap_old = dap->ap_current;
ap_old = dap_ap_get_select(dap);
dap_ap_select(dap, ap);
retval = dap_queue_ap_read(dap, AP_REG_BASE, dbgbase);
@@ -873,7 +873,7 @@ int dap_lookup_cs_component(struct adiv5_dap *dap, int ap,
return ERROR_COMMAND_SYNTAX_ERROR;
*addr = 0;
ap_old = dap->ap_current;
ap_old = dap_ap_get_select(dap);
dap_ap_select(dap, ap);
do {
@@ -1408,7 +1408,7 @@ static int dap_info_command(struct command_context *cmd_ctx,
if (retval != ERROR_OK)
return retval;
ap_old = dap->ap_current;
ap_old = dap_ap_get_select(dap);
dap_ap_select(dap, ap);
/* Now we read ROM table ID registers, ref. ARM IHI 0029B sec */