misc ARM help/usage updates

[openocd.git] / src / target / arm_adi_v5.c

diff --git a/src/target/arm_adi_v5.c b/src/target/arm_adi_v5.c
index 96accf3ec27b3f01ce2e7eb88b8fbf9d92b73c97..e490f2e546b8b3c809da91f2db8937a450707d6f 100644 (file)
--- a/src/target/arm_adi_v5.c
+++ b/src/target/arm_adi_v5.c
@@ -101,6 +101,10 @@ static int adi_jtag_dp_scan(struct swjdp_common *swjdp,
        arm_jtag_set_instr(jtag_info, instr, NULL);
 
        /* Add specified number of tck clocks before accessing memory bus */
+
+       /* REVISIT these TCK cycles should be *AFTER*  updating APACC, since
+        * they provide more time for the (MEM) AP to complete the read ...
+        */
        if ((instr == JTAG_DP_APACC)
                        && ((reg_addr == AP_REG_DRW)
                                || ((reg_addr & 0xF0) == AP_REG_BD0))
@@ -137,6 +141,10 @@ static int adi_jtag_dp_scan_u32(struct swjdp_common *swjdp,
        arm_jtag_set_instr(jtag_info, instr, NULL);
 
        /* Add specified number of tck clocks before accessing memory bus */
+
+       /* REVISIT these TCK cycles should be *AFTER*  updating APACC, since
+        * they provide more time for the (MEM) AP to complete the read ...
+        */
        if ((instr == JTAG_DP_APACC)
                        && ((reg_addr == AP_REG_DRW)
                                || ((reg_addr & 0xF0) == AP_REG_BD0))