imx-kobs: Allow kobs-ng to flash the SPL on the 4.x kernel

Add function to check if kernel support raw_mode and fix function that
calculates the geometry based on known info from the mtd partitionmtd
geometry.

These patches were copied from:
https://github.com/Gateworks/openwrt/commit/379e87df4fb67198fe900ffe2a394e69fbd47801

Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

3 files changed, 81 insertions, 0 deletions

diff --git a/recipes-bsp/imx-kobs/imx-kobs/fix-cal_nfc_geometry.patch b/recipes-bsp/imx-kobs/imx-kobs/fix-cal_nfc_geometry.patch
new file mode 100644
index 00000000..dddb49a1
--- /dev/null
+++ b/recipes-bsp/imx-kobs/imx-kobs/fix-cal_nfc_geometry.patch
@@ -0,0 +1,31 @@
+The Freescale downstream vendor kernel has a patch that exports the bch
+flash geometry via a debugfs file. This is not available in mainline linux
+kernels so the fallback method calculates the geometry based on known info
+from the mtd partition. A bug exists in this funcion where it fails to
+assume that block0 ECC is the same as the other blocks by default.
+
+Upstream-Status: Pending
+
+--- a/src/mtd.c
++++ b/src/mtd.c
+@@ -610,7 +610,7 @@ static int cal_nfc_geometry(struct mtd_d
+        /* The two are fixed, please change them when the driver changes. */
+        geo->metadata_size_in_bytes = 10;
+        geo->gf_len = 13;
+-       geo->ecc_chunkn_size_in_bytes = 512;
++       geo->ecc_chunkn_size_in_bytes = geo->ecc_chunk0_size_in_bytes = 512;
+ 
+        if (mtd->oobsize > geo->ecc_chunkn_size_in_bytes) {
+                geo->gf_len = 14;
+@@ -700,8 +700,9 @@ int parse_nfc_geometry(struct mtd_data *
+        unsigned int       value;
+ 
+        if (!plat_config_data->m_u32UseNfcGeo) {
++               /* fsl kernel patch provides bch_geometry via debugfs */
+                if (!(node = fopen(dbg_geometry_node_path, "r"))) {
+-                       fprintf(stderr, "Cannot open BCH geometry node: \"%s\"",
++                       fprintf(stderr, "Cannot open BCH geometry node: \"%s\"\n",
+                                dbg_geometry_node_path);
+                        return cal_nfc_geometry(md);
+                }
+
diff --git a/recipes-bsp/imx-kobs/imx-kobs/raw-mode.patch b/recipes-bsp/imx-kobs/imx-kobs/raw-mode.patch
new file mode 100644
index 00000000..76c2440a
--- /dev/null
+++ b/recipes-bsp/imx-kobs/imx-kobs/raw-mode.patch
@@ -0,0 +1,48 @@
+The downstream Freescale vendor kernel has a patch that allows determining
+if raw NAND flash mode is provided via a debugfs file. This is not present
+in upstream kernels, but the raw access support was added in the 3.19
+kernel, so we will check the kernel version if we can't find the file.
+
+Upstream-Status: Pending
+
+--- a/src/mtd.c
++++ b/src/mtd.c
+@@ -34,6 +34,7 @@
+ #include <errno.h>
+ #include <sys/types.h>
+ #include <sys/ioctl.h>
++#include <sys/utsname.h>
+ 
+ #include "mtd.h"
+ #include "rand.h"
+@@ -808,15 +809,27 @@ struct mtd_data *mtd_open(const struct m
+        md->cfg = *cfg;
+ 
+        /* check if use new raw access mode */
++       /* by looking for debugfs from fsl patch */
++       md->raw_mode_flag = 0;
+        fp = fopen("/sys/kernel/debug/gpmi-nand/raw_mode", "r");
+        if (!fp) {
+-               md->raw_mode_flag = 0;
+-               vp(md, "mtd: use legacy raw access mode\n");
++               /* fallback to kernel version: raw access added in 3.19 */
++               struct utsname uts;
++               if (!uname(&uts)) {
++                       int major = 0, minor = 0;
++                       sscanf(uts.release, "%d.%d", &major, &minor);
++                       vp(md, "mtd: Linux %d.%d\n", major, minor);
++                       if ((major << 8 | minor) > (3 << 8 | 18))
++                               md->raw_mode_flag = 1;
++               }
+        } else {
+                fclose(fp);
+                md->raw_mode_flag = 1;
+-               vp(md, "mtd: use new bch layout raw access mode\n");
+        }
++       if (md->raw_mode_flag)
++               vp(md, "mtd: use new bch layout raw access mode\n");
++       else
++               vp(md, "mtd: use legacy raw access mode\n");
+ 
+        if (plat_config_data->m_u32UseMultiBootArea) {
+ 
diff --git a/recipes-bsp/imx-kobs/imx-kobs_5.4.bb b/recipes-bsp/imx-kobs/imx-kobs_5.4.bb
index 1d33d40b..de396a17 100644
--- a/recipes-bsp/imx-kobs/imx-kobs_5.4.bb
+++ b/recipes-bsp/imx-kobs/imx-kobs_5.4.bb
@@ -7,6 +7,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=393a5ca445f6965873eca0259a17f833"
 
 SRC_URI = "${FSL_MIRROR}/imx-kobs-${PV}.tar.gz \
            file://fix-compile.patch \
+           file://raw-mode.patch \
+           file://fix-cal_nfc_geometry.patch \
 "
 
 SRC_URI[md5sum] = "77467d834f858c2ec216841583e5f437"