[PATCH v1 1/3] ARM: dts: am335x-bone: add support for beaglebone NAND cape
Pekon Gupta
pekon at ti.com
Wed Mar 12 06:49:18 EDT 2014
Beaglebone Board can be connected to expansion boards to add devices to them.
These expansion boards are called 'capes'. This patch adds support for
following versions of Beaglebone(AM335x) NAND capes
(a) NAND Device with bus-width=16, block-size=128k, page-size=2k, oob-size=64
(b) NAND Device with bus-width=16, block-size=256k, page-size=4k, oob-size=224
Further information and datasheets can be found at [1] and [2]
* How to boot from NAND using Memory Expander + NAND Cape ? *
- Important: As BOOTSEL values are sampled only at POR, so after changing any
setting on SW2 (DIP switch), disconnect and reconnect all board power supply
(including mini-USB console port) to POR the beaglebone.
- Selection of ECC scheme
for NAND cape(a), ROM code expects BCH8_HW ecc-scheme
for NAND cape(b), ROM code expects BCH16_HW ecc-scheme
- Selction of boot modes can be controlled via DIP switch(SW2) present on
Memory Expander cape.
SW2[SWITCH_BOOT] == OFF follow default boot order MMC-> SPI -> UART -> USB
SW2[SWITCH_BOOT] == ON boot mode selected via DIP switch(SW2)
So to flash NAND, first boot via MMC or other sources and then switch to
SW2[SWITCH_BOOT]=ON to boot from NAND Cape.
- For NAND boot following switch settings need to be followed
SW2[ 0] = ON (SYSBOOT[ 0]==0: NAND boot mode selected )
SW2[ 1] = ON (SYSBOOT[ 1]==0: -- do -- )
SW2[ 2] = OFF (SYSBOOT[ 2]==1: -- do -- )
SW2[ 3] = OFF (SYSBOOT[ 3]==1: -- do -- )
SW2[ 4] = ON (SYSBOOT[ 4]==0: -- do -- )
SW2[ 8] = OFF (SYSBOOT[ 8]==1: 0:x8 device, 1:x16 device )
SW2[ 9] = ON (SYSBOOT[ 9]==0: ECC done by ROM )
SW2[10] = ON (SYSBOOT[10]==0: Non Muxed device )
SW2[11] = ON (SYSBOOT[11]==0: -- do -- )
[1] http://beagleboardtoys.info/index.php?title=BeagleBone_Memory_Expansion
[2] http://beagleboardtoys.info/index.php?title=BeagleBone_4Gb_16-Bit_NAND_Module
Signed-off-by: Pekon Gupta <pekon at ti.com>
---
arch/arm/boot/dts/am335x-bone.dts | 123 ++++++++++++++++++++++++++++++++++++++
1 file changed, 123 insertions(+)
diff --git a/arch/arm/boot/dts/am335x-bone.dts b/arch/arm/boot/dts/am335x-bone.dts
index 94ee427..be2c572 100644
--- a/arch/arm/boot/dts/am335x-bone.dts
+++ b/arch/arm/boot/dts/am335x-bone.dts
@@ -10,6 +10,36 @@
#include "am33xx.dtsi"
#include "am335x-bone-common.dtsi"
+&am33xx_pinmux {
+ nand_flash_x16: nand_flash_x16 {
+ pinctrl-single,pins = <
+ 0x00 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad0.gpmc_ad0 */
+ 0x04 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad1.gpmc_ad1 */
+ 0x08 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad2.gpmc_ad2 */
+ 0x0c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad3.gpmc_ad3 */
+ 0x10 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad4.gpmc_ad4 */
+ 0x14 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad5.gpmc_ad5 */
+ 0x18 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad6.gpmc_ad6 */
+ 0x1c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad7.gpmc_ad7 */
+ 0x20 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad8.gpmc_ad8 */
+ 0x24 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad9.gpmc_ad9 */
+ 0x28 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad10.gpmc_ad10 */
+ 0x2c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad11.gpmc_ad11 */
+ 0x30 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad12.gpmc_ad12 */
+ 0x34 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad13.gpmc_ad13 */
+ 0x38 (MUX_MODE0 | PIN_INPUT) /* gpmc_ad14.gpmc_ad14 */
+ 0x3c (MUX_MODE0 | PIN_INPUT) /* gpmc_ad15.gpmc_ad15 */
+ 0x70 (MUX_MODE0 | PIN_INPUT_PULLUP ) /* gpmc_wait0.gpmc_wait0 */
+ 0x74 (MUX_MODE7 | PIN_OUTPUT_PULLUP) /* gpmc_wpn.gpio0_30 */
+ 0x7c (MUX_MODE0 | PIN_OUTPUT_PULLUP) /* gpmc_csn0.gpmc_csn0 */
+ 0x90 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_advn_ale.gpmc_advn_ale */
+ 0x94 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_oen_ren.gpmc_oen_ren */
+ 0x98 (MUX_MODE0 | PIN_OUTPUT) /* gpmc_wen.gpmc_wen */
+ 0x9c (MUX_MODE0 | PIN_OUTPUT) /* gpmc_be0n_cle.gpmc_be0n_cle */
+ >;
+ };
+};
+
&ldo3_reg {
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3300000>;
@@ -27,3 +57,96 @@
&aes {
status = "okay";
};
+
+/*
+ * uncomment following to enable NAND cape support
+ * &mmc2 {
+ * status = "disabled";
+ * };
+ * &elm {
+ * status = "okay";
+ * };
+ * &gpmc {
+ * status = "okay";
+ * };
+ */
+&gpmc {
+ pinctrl-names = "default";
+ pinctrl-0 = <&nand_flash_x16>;
+ ranges = <0 0 0x08000000 0x10000000>; /* CS0: NAND */
+ nand at 0,0 {
+ reg = <0 0 0>; /* CS0, offset 0 */
+ ti,nand-ecc-opt = "bch8";
+ ti,elm-id = <&elm>;
+ nand-bus-width = <16>;
+ gpmc,device-width = <2>;
+ gpmc,sync-clk-ps = <0>;
+ gpmc,cs-on-ns = <0>;
+ gpmc,cs-rd-off-ns = <80>;
+ gpmc,cs-wr-off-ns = <80>;
+ gpmc,adv-on-ns = <0>;
+ gpmc,adv-rd-off-ns = <80>;
+ gpmc,adv-wr-off-ns = <80>;
+ gpmc,we-on-ns = <20>;
+ gpmc,we-off-ns = <60>;
+ gpmc,oe-on-ns = <20>;
+ gpmc,oe-off-ns = <60>;
+ gpmc,access-ns = <40>;
+ gpmc,rd-cycle-ns = <80>;
+ gpmc,wr-cycle-ns = <80>;
+ gpmc,wait-on-read = "true";
+ gpmc,wait-on-write = "true";
+ gpmc,bus-turnaround-ns = <0>;
+ gpmc,cycle2cycle-delay-ns = <0>;
+ gpmc,clk-activation-ns = <0>;
+ gpmc,wait-monitoring-ns = <0>;
+ gpmc,wr-access-ns = <40>;
+ gpmc,wr-data-mux-bus-ns = <0>;
+ /* MTD partition table */
+ /* All SPL-* partitions are sized to minimal length
+ * which can be independently programmable. For
+ * NAND flash this is equal to size of erase-block */
+ #address-cells = <1>;
+ #size-cells = <1>;
+ partition at 0 {
+ label = "NAND.SPL";
+ reg = <0x00000000 0x00040000>;
+ };
+ partition at 1 {
+ label = "NAND.SPL.backup1";
+ reg = <0x00040000 0x00040000>;
+ };
+ partition at 2 {
+ label = "NAND.SPL.backup2";
+ reg = <0x00080000 0x00040000>;
+ };
+ partition at 3 {
+ label = "NAND.SPL.backup3";
+ reg = <0x000C0000 0x00040000>;
+ };
+ partition at 4 {
+ label = "NAND.u-boot-spl-os";
+ reg = <0x00100000 0x00080000>;
+ };
+ partition at 5 {
+ label = "NAND.u-boot";
+ reg = <0x00180000 0x00100000>;
+ };
+ partition at 6 {
+ label = "NAND.u-boot-env";
+ reg = <0x00280000 0x00040000>;
+ };
+ partition at 7 {
+ label = "NAND.u-boot-env.backup1";
+ reg = <0x002C0000 0x00040000>;
+ };
+ partition at 8 {
+ label = "NAND.kernel";
+ reg = <0x00300000 0x00700000>;
+ };
+ partition at 9 {
+ label = "NAND.file-system";
+ reg = <0x00A00000 0x1F600000>;
+ };
+ };
+};
--
1.8.5.1.163.gd7aced9
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