With this, the OCCs are able to be onlined.

Note that this embeds a power limit, which may be board/system specific.

ipmi_bt.h

@@ -85,6 +85,7 @@
 // DCMI response codes
 #define DCMI_CC_NO_ERROR        0x00
 #define DCMI_CC_INVALID_COMMAND 0xc1
+#define DCMI_CC_NO_POWER_LIMIT  0x80
 
 // DCMI parameters
 #define DCMI_ENFORCE_POWER_LIMIT 0
@@ -172,4 +173,31 @@ typedef struct __attribute__((packed)) ipmi_response_message
     uint8_t data[256 - BASE_IPMI_REQUEST_LENGTH];
 } ipmi_response_message_t;
 
+/* All fields a little endian encoded. However the cputole* and le*tocpu
+ * functions are not currently implemented, and further more there are
+ * no non-trivial values to convert.
+ */
+struct power_limit_data_desc
+{
+    struct __attribute__((packed))
+    {
+        uint8_t group_ext_id;
+        uint16_t reserved0;
+        uint8_t fail_response;
+        uint16_t max_watts;
+        uint32_t correct_time_ms;
+        uint16_t reserved1;
+        /* Sampling period, in seconds */
+        uint16_t period;
+    } packet;
+    uint8_t completion_code;
+};
+
+enum
+{
+    PowerLimitDataGeneric = 0,
+};
+
+#define POWERLIMIT_EXECTPION_ACT_HARD_SHUTDOWN 1
+
 #endif // _IPMI_BT_H

main.c

@@ -10,6 +10,7 @@
 
 #include <console.h>
 #include <crc.h>
+#include <endian.h>
 #include <generated/csr.h>
 #include <generated/mem.h>
 #include <irq.h>
@@ -136,6 +137,18 @@ static const cpu_info_t g_cpu_info[] = {
 };
 #define MAX_CPUS_SUPPORTED (sizeof(g_cpu_info) / sizeof(g_cpu_info[0]))
 
+static const struct power_limit_data_desc board_power_limits[] = {
+    [PowerLimitDataGeneric] =
+    {
+        .packet =
+        {
+            .fail_response = POWERLIMIT_EXECTPION_ACT_HARD_SHUTDOWN,
+            .max_watts = 0,
+        },
+        .completion_code = DCMI_CC_NO_POWER_LIMIT,
+    },
+};
+
 void primary_service_event_loop(void);
 
 static char *readstr(void)
@@ -816,7 +829,23 @@ static void process_host_to_bmc_ipmi_bt_transactions(void)
                     unhandled_ipmi_command = 1;
                     break;
                 case IPMI_NETFN_DCMI_GP_REQ:
-                    unhandled_ipmi_command = 1;
+                    switch (ipmi_bt_current_request.command)
+                    {
+                        case DCMI_CMD_GET_POWER_CAP:
+                        {
+                            /* Only a generic P9 profile with no power
+                             * limits is support atm.*/
+                            uint32_t limit_index = PowerLimitDataGeneric;
+                            memcpy(response.data, &board_power_limits[limit_index].packet, sizeof(board_power_limits[0].packet));
+
+                            response.completion_code = board_power_limits[limit_index].completion_code;
+                            response.length = BASE_DCMI_RESPONSE_LENGTH + sizeof(board_power_limits[0].packet);
+                        }
+                        break;
+                        default:
+                            unhandled_ipmi_command = 1;
+                            break;
+                    }
                     break;
                 case IPMI_NETFN_OEM_IBM_REQ:
                     switch (ipmi_bt_current_request.command)