ZHCAFK3 July 2025 AM625 , AM62P
在 MTD 驱动程序中，添加用于寄存器访问的全局范围函数。在 linux sdk 的 /board-support/ti-u-boot/drivers/mtd/spi/spi/spi-nor-core.c 和 /board-support/ti-u-boot/include/linux/mtd/spi-nor.h 文件中，有两个文件作用域的函数 spansion_read_any_reg() 和 spansion_write_any_reg()，可以执行寄存器访问操作。添加用于包装局部函数的全局作用域函数，以便命令行工具可以使用这些函数。TI 建议将代码添加到源文件的底部。补丁如下代码所示。
diff --git a/drivers/mtd/spi/spi-nor-core.c
b/drivers/mtd/spi/spi-nor-core.c
index 232a0ac3a9..b532ac6a08 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -4178,3 +4195,24 @@ int spi_flash_cmd_get_sw_write_prot(struct spi_nor *nor)
return (sr >> 2) & 7;
}
+
+
+#ifdef CONFIG_SPI_FLASH_SPANSION
+ int spi_nor_read_any_reg(struct spi_nor *nor, u32 addr,
+ u8 dummy, u8 *val)
+ {
+ return spansion_read_any_reg(nor, addr, dummy, val);
+ }
+
+ int spi_nor_write_any_reg(struct spi_nor *nor, u32 addr,
+ u8 val)
+ {
+ int ret;
+
+ ret = write_enable(nor);
+ if (ret)
+ return ret;
+
+ return spansion_write_any_reg(nor, addr, val);
+ }
+ #endif
diff --git a/include/linux/mtd/spi-nor.h
b/include/linux/mtd/spi-nor.h
index 2861b73edb..01a651ebeb 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -652,3 +652,10 @@ int spi_nor_remove(struct spi_nor *nor);
#endif
#endif
+
+#ifdef CONFIG_SPI_FLASH_SPANSION
+ int spi_nor_read_any_reg(struct spi_nor *nor, u32 addr,
+ u8 dummy, u8 *val);
+ int spi_nor_write_any_reg(struct spi_nor *nor, u32 addr,
+ u8 val);
+ #endif
\ No newline at end of file使用以下代码，在 U-Boot 控制台中，添加提供寄存器访问的新命令。～/board-support/ti-u-boot/cmd/sf.c 定义可从 U-Boot 使用的 SPI 闪存访问命令，如读取、写入和擦除。do_spi_rdar() 函数响应 rdar 命令执行寄存器读取操作。将命令行参数解析为寄存器地址和虚拟周期数，然后将寄存器值打印到控制台。do_spi_wrar () 执行寄存器写入以响应 wrar 命令。将命令行参数解析为寄存器地址和要写入的新寄存器值。
若要调用这些函数，必须在现有的 do_spi_flash() 函数控制台中插入其他 else-if 块。
diff --git a/cmd/sf.c
b/cmd/sf.c
index 11b9c25896..465bf962ec 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -160,6 +160,59 @@ static int do_spi_flash_probe(int argc, char *const argv[])
return 0;
}
+static int do_spi_rdar(int argc, char * const argv[])
+ {
+ int ret = 0;
+ loff_t ofs;
+ ulong dummy;
+ u8 val;
+ if (argc != 3)
+ return -1;
+ if (!str2off(argv[1], &ofs)) {
+ puts("register address is not a valid number\n");
+ return 1;
+ }
+ if (!str2long(argv[2], &dummy)) {
+ puts("register address is not a valid number\n");
+ return 1;
+ }
+ ret = spi_nor_read_any_reg(flash, ofs, (u8)dummy, &val);
+ if (ret == 0)
+ printf("%02X\n", val);
+ else
+ puts("failed to read register\n");
+ return ret == 0 ? 0 : 1;
+ }
+ static int do_spi_wrar(int argc, char * const argv[])
+ {
+ int ret = 0;
+ loff_t ofs;
+ ulong val;
+ if (argc != 3)
+ return -1;
+ if (!str2off(argv[1], &ofs)) {
+ puts("register address is not a valid number\n");
+ return 1;
+ }
+ if (!str2long(argv[2], &val)) {
+ puts("val is not a valid number\n");
+ return 1;
+ }
+ ret = spi_nor_write_any_reg(flash, ofs, (u8)val);
+
+ return ret == 0 ? 0 : 1;
+ }
/**
* Write a block of data to SPI flash, first checking if it is different from
@@ -603,6 +656,10 @@ static int do_spi_flash(struct cmd_tbl *cmdtp, int flag, int argc,
ret = do_spi_protect(argc, argv);
else if (IS_ENABLED(CONFIG_CMD_SF_TEST) && !strcmp(cmd, "test"))
ret = do_spi_flash_test(argc, argv);
+ else if (strcmp(cmd, "rdar") == 0)
+ ret = do_spi_rdar(argc, argv);
+ else if (strcmp(cmd, "wrar") == 0)
+ ret = do_spi_wrar(argc, argv);
else
ret = CMD_RET_USAGE;此外，要添加一些要打印到控制台的调试日志，请使用以下代码作为参考来打印 opcode、nbytes、buswidth、dtr，dummy.nbytes 参数，以实现更高效的调试。
diff --git a/drivers/mtd/spi/spi-nor-core.c
b/drivers/mtd/spi/spi-nor-core.c
index 232a0ac3a9..b532ac6a08 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -335,6 +335,17 @@ static int spansion_read_any_reg(struct spi_nor *nor, u32 addr, u8 dummy,
SPI_MEM_OP_DUMMY(dummy / 8, 1),
SPI_MEM_OP_DATA_IN(1, NULL, 1));
+ printf("*** [%s] [%d] op.cmd.opcode= [%d]\n",__func__,__LINE__, op.cmd.opcode);
+ printf("*** [%s] [%d] op.cmd.nbytes= [%d]\n",__func__,__LINE__, op.cmd.nbytes);
+ printf("*** [%s] [%d] op.cmd.buswidth= [%d]\n",__func__,__LINE__, op.cmd.buswidth);
+ printf("*** [%s] [%d] op.cmd.dtr= [%d]\n",__func__,__LINE__, op.cmd.dtr);
+
+
+// printf("*** [%s] [%d] op.addr.val= [%d]\n",__func__,__LINE__, op.addr.val);
+ printf("*** [%s] [%d] op.dummy.nbytes= [%d]\n",__func__,__LINE__, op.dummy.nbytes);
+
+
+
return spi_nor_read_write_reg(nor, &op, val);
}
@@ -414,6 +425,12 @@ static ssize_t spi_nor_read_data(struct spi_nor *nor, loff_t from, size_t len,
op.data.buf.in += op.data.nbytes;
}
+ printf("*** [%s] [%d] op.cmd.opcode= [%d]\n",__func__,__LINE__, op.cmd.opcode);
+ printf("*** [%s] [%d] op.cmd.nbytes= [%d]\n",__func__,__LINE__, op.cmd.nbytes);
+ printf("*** [%s] [%d] op.cmd.buswidth= [%d]\n",__func__,__LINE__, op.cmd.buswidth);
+ printf("*** [%s] [%d] op.cmd.dtr= [%d]\n",__func__,__LINE__, op.cmd.dtr);
+ printf("*** [%s] [%d] op.dummy.nbytes= [%d]\n",__func__,__LINE__, op.dummy.nbytes);
+
return len;
}若要将模式更改为 1 行模式，请将闪存保持在尽可能低的设置值。可以应用以下代码；此项更改可选。以下代码是基于 AM64 SDK 的示例。
diff --git a/arch/arm/dts/k3-am642-evm.dts
b/arch/arm/dts/k3-am642-evm.dts
index 7f82730736..76d660a561 100644
--- a/arch/arm/dts/k3-am642-evm.dts
+++ b/arch/arm/dts/k3-am642-evm.dts
@@ -463,8 +463,8 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0x0>;
- spi-tx-bus-width = <8>;
- spi-rx-bus-width = <8>;
+ spi-tx-bus-width = <1>;
+ spi-rx-bus-width = <1>;
spi-max-frequency = <25000000>;
cdns,tshsl-ns = <60>;
cdns,tsd2d-ns = <60>;
diff --git a/arch/arm/dts/k3-am642-r5-evm.dts
b/arch/arm/dts/k3-am642-r5-evm.dts
index 6b32be1c4c..482f1ef639 100644
--- a/arch/arm/dts/k3-am642-r5-evm.dts
+++ b/arch/arm/dts/k3-am642-r5-evm.dts
@@ -308,8 +308,8 @@
flash@0{
compatible = "jedec,spi-nor";
reg = <0x0>;
- spi-tx-bus-width = <8>;
- spi-rx-bus-width = <8>;
+ spi-tx-bus-width = <1>;
+ spi-rx-bus-width = <1>;
spi-max-frequency = <25000000>;
cdns,tshsl-ns = <60>;
cdns,tsd2d-ns = <60>;
diff --git a/arch/arm/dts/k3-am642-r5-sk.dts
b/arch/arm/dts/k3-am642-r5-sk.dts
index 6701e754bb..815dd5cb9b 100644
--- a/arch/arm/dts/k3-am642-r5-sk.dts
+++ b/arch/arm/dts/k3-am642-r5-sk.dts
@@ -290,8 +290,8 @@
flash@0{
compatible = "jedec,spi-nor";
reg = <0x0>;
- spi-tx-bus-width = <8>;
- spi-rx-bus-width = <8>;
+ spi-tx-bus-width = <1>;
+ spi-rx-bus-width = <1>;
spi-max-frequency = <25000000>;
cdns,tshsl-ns = <60>;
cdns,tsd2d-ns = <60>;
diff --git a/arch/arm/dts/k3-am642-sk.dts
b/arch/arm/dts/k3-am642-sk.dts
index cbb10a4964..b2ee7e6965 100644
--- a/arch/arm/dts/k3-am642-sk.dts
+++ b/arch/arm/dts/k3-am642-sk.dts
@@ -482,8 +482,8 @@
flash@0 {
compatible = "jedec,spi-nor";
reg = <0x0>;
- spi-tx-bus-width = <8>;
- spi-rx-bus-width = <8>;
+ spi-tx-bus-width = <1>;
+ spi-rx-bus-width = <1>;
spi-max-frequency = <25000000>;
cdns,tshsl-ns = <60>;
cdns,tsd2d-ns = <60>;