auracaster/openocd
3
0
Fork 1
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm_adi_v5: fix access to 64-bit MEM-AP

Browse Source 
Commit ac22cdc573 ("target/adiv5: Large Physical Address
Extension") reads the register MEM_AP_REG_CFG and keeps it in a
new field of struct adiv5_ap. The test on LE bit (Large Extension)
is used to identify if mem_ap addresses are 32 or 64 bits.
But the register MEM_AP_REG_CFG is only read during mem_ap_init(),
that is called only when the AP is used as a target debug AP or if
a target mem_ap is attached to that AP.

The openocd commands '<dapname> baseaddr', '<dapname> info' and
'dap info' can be executed on AP that has not been associated yet
to a target, thus executed without any knowledge of MEM_AP_REG_CFG
value. The initialization to ADI_BAD_CFG causes openocd to always
use 32 bit mode on un-associated APs.

Verify if MEM_AP_REG_CFG has not been read and eventually read it.
In case of 32 bits mode AP, MEM_AP_REG_BASE64 is defined as 'RES0'
(reserved, but readable); the code can queue both the read of
MEM_AP_REG_CFG and MEM_AP_REG_BASE64, before knowing if the former
is required. This speeds-up the operation.
Rename ADI_BAD_CFG as MEM_AP_REG_CFG_INVALID.

Change-Id: If3bbd792b56a483022c37ccc2ce82b5ba5c36caa
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: ac22cdc573 ("target/adiv5: Large Physical Address Extension")
Reviewed-on: http://openocd.zylin.com/6412
Tested-by: jenkins
Reviewed-by: Daniel Goehring <dgoehrin@os.amperecomputing.com>
This commit is contained in:
Antonio Borneo
2021-08-05 17:08:11 +02:00
parent 2f97856c5b
commit 020e46d186
3 changed files with 27 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/target/arm_dap.c
View File

@@ -36,8 +36,6 @@ extern const struct dap_ops swd_dap_ops;
extern const struct dap_ops jtag_dp_ops;
extern struct adapter_driver *adapter_driver;
#define ADI_BAD_CFG 0xBAD00000
/* DAP command support */
struct arm_dap_object {
struct list_head lh;
@@ -59,7 +57,7 @@ static void dap_instance_init(struct adiv5_dap *dap)
dap->ap[i].tar_autoincr_block = (1<<10);
/* default CSW value */
dap->ap[i].csw_default = CSW_AHB_DEFAULT;
dap->ap[i].cfg_reg = ADI_BAD_CFG; /* mem_ap configuration reg (large physical addr, etc.) */
dap->ap[i].cfg_reg = MEM_AP_REG_CFG_INVALID; /* mem_ap configuration reg (large physical addr, etc.) */
}
INIT_LIST_HEAD(&dap->cmd_journal);
INIT_LIST_HEAD(&dap->cmd_pool);