NAND configuration problem on AM335x

Hi,

I will ask the software team to comment. However my first suggestion is that you use the officially released Linux SDK, which can be downloaded from here: software-dl.ti.com/.../index_FDS.html

I am currently using ti-processor-sdk-linux-am335x-evm-02.00.00.00 sdk. Do you think there might be essential changes that can help to solve NAND issue?

Best regards,
Ilja

No, your version should be fine. I have asked the software team to help.

Currently I have a different problem with nand, which looks like this:

[ 1.797298] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 1.802853] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[ 1.810106] omap-gpmc 50000000.gpmc: cannot request GPMC CS 0
[ 1.816232] omap-gpmc 50000000.gpmc: failed to probe DT children
[ 1.822987] mmc0: new high speed SDHC card at address 1234
[ 1.829989] mmcblk0: mmc0:1234 SA08G 7.21 GiB
[ 1.836478] omap-gpmc: probe of 50000000.gpmc failed with error -16

I am checking with the working custom linux which is (v3.12) and the boot sequence is different:
[ 1.797298] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 1.802853] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
nand: ONFI param page 0 valid
nand: ONFI flash detected

I am still wondering if there is a device tree issue or maybe kernel configuration.

Any suggestion would be great,

Best regards,
Ilja

Hi Ilja,

Can you execute of_dump from barebox, & share the output (your DTS configuration)?

Best Regars,
Yordan

Here is the last part of the device tree:


elm@48080000 {
compatible = "ti,am3352-elm";
reg = <0x48080000 0x2000>;
interrupts = <0x4>;
ti,hwmods = "elm";
status = "disabled";
linux,phandle = <0x34>;
phandle = <0x34>;
};
lcdc@4830e000 {
compatible = "ti,am33xx-tilcdc";
reg = <0x4830e000 0x1000>;
interrupt-parent = <0x1>;
interrupts = <0x24>;
ti,hwmods = "lcdc";
status = "disabled";
};
tscadc@44e0d000 {
compatible = "ti,am3359-tscadc";
reg = <0x44e0d000 0x1000>;
interrupt-parent = <0x1>;
interrupts = <0x10>;
ti,hwmods = "adc_tsc";
status = "disabled";
tsc {
compatible = "ti,am3359-tsc";
};
adc {
#io-channel-cells = <0x1>;
compatible = "ti,am3359-adc";
};
};
gpmc@50000000 {
compatible = "ti,am3352-gpmc";
ti,hwmods = "gpmc";
ti,no-idle-on-init;
reg = <0x50000000 0x2000>;
interrupts = <0x64>;
gpmc,num-cs = <0x7>;
gpmc,num-waitpins = <0x2>;
#address-cells = <0x2>;
#size-cells = <0x1>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <0x33>;
ranges = <0x0 0x0 0x8000000 0x10000000>;
nand@0,0 {
reg = <0x0 0x0 0x0>;
nand-bus-width = <0x8>;
ti,nand-ecc-opt = "bch8";
gpmc,device-nand = "true";
gpmc,device-width = <0x1>;
gpmc,sync-clk-ps = <0x0>;
gpmc,cs-on-ns = <0x0>;
gpmc,cs-rd-off-ns = <0x1e>;
gpmc,cs-wr-off-ns = <0x1e>;
gpmc,adv-on-ns = <0x0>;
gpmc,adv-rd-off-ns = <0x1e>;
gpmc,adv-wr-off-ns = <0x1e>;
gpmc,we-on-ns = <0x0>;
gpmc,we-off-ns = <0x14>;
gpmc,oe-on-ns = <0xa>;
gpmc,oe-off-ns = <0x1e>;
gpmc,access-ns = <0x1e>;
gpmc,rd-cycle-ns = <0x1e>;
gpmc,wr-cycle-ns = <0x1e>;
gpmc,wait-pin = <0x1>;
gpmc,wait-on-read = "true";

gpmc,wait-on-write = "true";
gpmc,bus-turnaround-ns = <0x0>;
gpmc,cycle2cycle-delay-ns = <0x32>;
gpmc,cycle2cycle-diffcsen;
gpmc,clk-activation-ns = <0x0>;
gpmc,wait-monitoring-ns = <0x0>;
gpmc,wr-access-ns = <0x0>;
gpmc,wr-data-mux-bus-ns = <0x0>;
#address-cells = <0x1>;
#size-cells = <0x1>;
elm_id = <0x34>;
partition@0 {
label = "xload";
reg = <0x0 0x20000>;
};
partition@1 {
label = "xload_backup1";
reg = <0x20000 0x20000>;
};
partition@2 {
label = "xload_backup2";
reg = <0x40000 0x20000>;
};
partition@3 {
label = "xload_backup3";
reg = <0x60000 0x20000>;
};
partition@4 {
label = "barebox";
reg = <0x80000 0x80000>;
};
partition@5 {
label = "bareboxenv";
reg = <0x100000 0x40000>;
};
partition@6 {
label = "oftree";
reg = <0x140000 0x40000>;
};
partition@7 {
label = "kernel";
reg = <0x180000 0x800000>;
};
partition@8 {
label = "root";
reg = <0x980000 0x0>;
};
};
};

sham@53100000 {
compatible = "ti,omap4-sham";
ti,hwmods = "sham";
reg = <0x53100000 0x200>;
interrupts = <0x6d>;
dmas = <0x25 0x24>;
dma-names = "rx";
};
aes@53500000 {
compatible = "ti,omap4-aes";
ti,hwmods = "aes";
reg = <0x53500000 0xa0>;
interrupts = <0x67>;
dmas = <0x25 0x6 0x25 0x5>;
dma-names = "tx", "rx";
};
mcasp@48038000 {
compatible = "ti,am33xx-mcasp-audio";
ti,hwmods = "mcasp0";
reg = <0x48038000 0x2000 0x46000000 0x400000>;
reg-names = "mpu", "dat";
interrupts = <0x50 0x51>;
interrupt-names = "tx", "rx";
status = "disabled";
dmas = <0x25 0x8 0x25 0x9>;
dma-names = "tx", "rx";
};
mcasp@4803C000 {
compatible = "ti,am33xx-mcasp-audio";
ti,hwmods = "mcasp1";
reg = <0x4803c000 0x2000 0x46400000 0x400000>;
reg-names = "mpu", "dat";
interrupts = <0x52 0x53>;
interrupt-names = "tx", "rx";
status = "disabled";
dmas = <0x25 0xa 0x25 0xb>;
dma-names = "tx", "rx";
};
rng@48310000 {
compatible = "ti,omap4-rng";
ti,hwmods = "rng";
reg = <0x48310000 0x2000>;
interrupts = <0x6f>;
};
};
};

Dear Yordan,
Thank you very much for your reply.

Well first of all, the of_dumb has been done from Barebox, where the NAND is detected and configured. From barebox I can see all the partitions, upload filesystem, kernel etc. So this is weird, if pinctrl-0 = <0x33>; in barebox and it still works. Here is what barebox detects:
nand: ONFI param page 0 valid
nand: ONFI flash detected
nand: NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron MT29F4G08ABADAH4), 512MiB, page size: 2048, OOB size: 64


The problem occurs when I boot kernel. As I wrote before, the NAND can be configured from kernel on the older(3.12.xx) linux versions which are custom from the supplier. When I use old zImage and DTB, the nand configures fine.
I have taken all device tree sources and checked kernel configuration for my newer linux version and here I fail with detecting.
The timing has been taken from the sources of custom kernel device tree.
am335x-phycore-som.dtsi:
/* This is a dummy node. Will be set by a bootloader */
memory {
device_type = "memory";
reg = <0x80000000 0x20000000>; /* 512 MB */
};

&am33xx_pinmux {
nandflash_pins: pinmux_nandflash {
pinctrl-single,pins = <
0x0 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad0.gpmc_ad0 */
0x4 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad1.gpmc_ad1 */
0x8 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad2.gpmc_ad2 */
0xc (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad3.gpmc_ad3 */
0x10 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad4.gpmc_ad4 */
0x14 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad5.gpmc_ad5 */
0x18 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad6.gpmc_ad6 */
0x1c (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_ad7.gpmc_ad7 */
0x70 (PIN_INPUT_PULLUP | MUX_MODE0) /* gpmc_wait0.gpmc_wait0 */
0x7c (PIN_OUTPUT | MUX_MODE0) /* gpmc_csn0.gpmc_csn0 */
0x90 (PIN_OUTPUT | MUX_MODE0) /* gpmc_advn_ale.gpmc_advn_ale */
0x94 (PIN_OUTPUT | MUX_MODE0) /* gpmc_oen_ren.gpmc_oen_ren */
0x98 (PIN_OUTPUT | MUX_MODE0) /* gpmc_wen.gpmc_wen */
0x9c (PIN_OUTPUT | MUX_MODE0) /* gpmc_be0n_cle.gpmc_be0n_cle */
>;
};
};

&elm {
status = "okay";
};

&gpmc {
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&nandflash_pins>;
ranges = <0 0 0x08000000 0x10000000>; /* CS0: NAND */
nandflash: nand@0,0 {
reg = <0 0 0>; /* CS0, offset 0 */
nand-bus-width = <8>;
ti,nand-ecc-opt = "bch8";
gpmc,device-nand = "true";
gpmc,device-width = <1>;
gpmc,sync-clk-ps = <0>;
gpmc,cs-on-ns = <0>;
gpmc,cs-rd-off-ns = <30>;
gpmc,cs-wr-off-ns = <30>;
gpmc,adv-on-ns = <0>;
gpmc,adv-rd-off-ns = <30>;
gpmc,adv-wr-off-ns = <30>;
gpmc,we-on-ns = <0>;
gpmc,we-off-ns = <20>;
gpmc,oe-on-ns = <10>;
gpmc,oe-off-ns = <30>;
gpmc,access-ns = <30>;
gpmc,rd-cycle-ns = <30>;
gpmc,wr-cycle-ns = <30>;
gpmc,wait-pin = <1>;
gpmc,wait-on-read = "true";
gpmc,wait-on-write = "true";
gpmc,bus-turnaround-ns = <0>;
gpmc,cycle2cycle-delay-ns = <50>;
gpmc,cycle2cycle-diffcsen;
gpmc,clk-activation-ns = <0>;
gpmc,wait-monitoring-ns = <0>;
gpmc,wr-access-ns = <0>;
gpmc,wr-data-mux-bus-ns = <0>;

ti,elm_id = <&elm>;

#address-cells = <1>;
#size-cells = <1>;
};
};

am335x-phycore-rdk.dts:
&nandflash {
status = "okay";
partition@0 {
label = "xload";
reg = <0x0 0x20000>;
};

partition@1 {
label = "xload_backup1";
reg = <0x20000 0x20000>;
};

partition@2 {
label = "xload_backup2";
reg = <0x40000 0x20000>;
};

partition@3 {
label = "xload_backup3";
reg = <0x60000 0x20000>;
};

partition@4 {
label = "barebox";
reg = <0x80000 0x80000>;
};

partition@5 {
label = "bareboxenv";
reg = <0x100000 0x40000>;
};

partition@6 {
label = "oftree";
reg = <0x140000 0x40000>;

};

partition@7 {
label = "kernel";
reg = <0x180000 0x800000>;
};

partition@8 {
label = "root";
/*
* setting size to 0x0 here, size will be extended to
* end of nand flash while booting.
*/
reg = <0x980000 0x0>;
};
};

am33xx.dtsi:
elm: elm@48080000 {
compatible = "ti,am3352-elm";
reg = <0x48080000 0x2000>;
interrupts = <4>;
ti,hwmods = "elm";
status = "disabled";
};
gpmc: gpmc@50000000 {
compatible = "ti,am3352-gpmc";
ti,hwmods = "gpmc";
ti,no-idle-on-init;
reg = <0x50000000 0x2000>;
interrupts = <100>;
gpmc,num-cs = <7>;
gpmc,num-waitpins = <2>;
#address-cells = <2>;
#size-cells = <1>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
status = "disabled";
};

Here is what happens at booting stage:
[ 1.784869] omap-gpmc 50000000.gpmc: GPMC revision 6.0
[ 1.790433] gpmc_mem_init: disabling cs 0 mapped at 0x0-0x1000000
[ 1.797705] omap-gpmc 50000000.gpmc: cannot request GPMC CS 0
[ 1.803859] omap-gpmc 50000000.gpmc: failed to probe DT children

consecuently, nand is not detected, and UBI rootfs from nand cannot be booted. everything is freezes.

I have checked the configuration multiple times, and still the driver fails to probe gpmc, especially with CS 0 pin. And again, it doesn't happen with custom builds.

Any suggestions? Is there a way to tell linux kernel to leave nand configuration the same way as it already configured in Barebox?

BR,
Ilja.