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器件型号：PROCESSOR-SDK-AM437X工具/软件：
您好、
我们有一块使用了很长时间的 AM437x gp EVM 板、系统是 Ubi NAND。 也会从 NAND 启动。 最近、我希望在 Hong 的支持下、成功地将 NAND 位宽度从 8 位增加到 16 位、从而提高系统的读取和写入速度。 然而,我发现从 NAND 引导后速度没有增加,而是变慢了。 我想知道增加位宽是否无法提高启动速度？ 这是否是由于系统速度实际下降的原因造成的？ Uboot 和 Linux 内核、系统、应用程序等与以前相同。
一般理解是、增加数据位宽度应该可以提高读取和写入速度。
8 位 NAND 的 DTS 时序：
nand@0,0 {
compatible = "ti,omap2-nand";
reg = <0 0 4>; /* device IO registers */
interrupt-parent = <&gpmc>;
interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
<1 IRQ_TYPE_NONE>; /* termcount */
rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
ti,nand-xfer-type = "prefetch-dma";
ti,nand-ecc-opt = "bch16";
ti,elm-id = <&elm>;
nand-bus-width = <8>;
gpmc,device-width = <1>;
gpmc,sync-clk-ps = <0>;
/*CONFIG2*/
gpmc,cs-on-ns = <0>;
gpmc,cs-rd-off-ns = <40>;
gpmc,cs-wr-off-ns = <40>;
/*CONFIG3*/
gpmc,adv-on-ns = <0>;
gpmc,adv-rd-off-ns = <25>;
gpmc,adv-wr-off-ns = <25>;
/*CONFIG4*/
gpmc,we-on-ns = <0>;
gpmc,we-off-ns = <20>;
gpmc,oe-on-ns = <3>;
gpmc,oe-off-ns = <30>;
/*CONFIG5*/
gpmc,access-ns = <30>;
gpmc,rd-cycle-ns = <40>;
gpmc,wr-cycle-ns = <40>;
/*CONFIG6*/
gpmc,bus-turnaround-ns = <0>;
gpmc,cycle2cycle-delay-ns = <0>;
gpmc,clk-activation-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>;
16 位 NAND 的 DTS 时序：
nand@0,0 {
compatible = "ti,omap2-nand";
reg = <0 0 4>; /* device IO registers */
interrupt-parent = <&gpmc>;
interrupts = <0 IRQ_TYPE_NONE>, /* fifoevent */
<1 IRQ_TYPE_NONE>; /* termcount */
rb-gpios = <&gpmc 0 GPIO_ACTIVE_HIGH>; /* gpmc_wait0 */
ti,nand-xfer-type = "prefetch-dma";
ti,elm-id = <&elm>;
ti,nand-ecc-opt = "bch8";
nand-bus-width = <16>;
gpmc,wait-pin = <0>;
gpmc,sync-clk-ps = <0>;
gpmc,cs-on-ns = <0>;
gpmc,cs-rd-off-ns = <44>;
gpmc,cs-wr-off-ns = <44>;
gpmc,adv-on-ns = <6>;
gpmc,adv-rd-off-ns = <34>;
gpmc,adv-wr-off-ns = <44>;
gpmc,we-off-ns = <40>;
gpmc,oe-off-ns = <54>;
gpmc,access-ns = <64>;
gpmc,rd-cycle-ns = <82>;
gpmc,wr-cycle-ns = <82>;
gpmc,wr-access-ns = <40>;
gpmc,wr-data-mux-bus-ns = <0>;
最好的注意！
Dudechao
