uboot-airoha: add readmem command

This command is required to read and set device MAC address. The patch
was copied from mediatek target.

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23569
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

diff --git a/package/boot/uboot-airoha/patches/201-cmd-env-readmem.patch b/package/boot/uboot-airoha/patches/201-cmd-env-readmem.patch
new file mode 100644 (file)
index 0000000..14a4ba1
--- /dev/null
+++ b/package/boot/uboot-airoha/patches/201-cmd-env-readmem.patch
@@ -0,0 +1,116 @@
+--- a/cmd/Kconfig
++++ b/cmd/Kconfig
+@@ -717,6 +717,12 @@ config CMD_ENV_EXISTS
+         Check if a variable is defined in the environment for use in
+         shell scripting.
+ 
++config CMD_ENV_READMEM
++      bool "env readmem"
++      default y
++      help
++        Store memory content into environment variable.
++
+ config CMD_ENV_CALLBACK
+       bool "env callbacks - print callbacks and their associated variables"
+       help
+--- a/cmd/nvedit.c
++++ b/cmd/nvedit.c
+@@ -273,6 +273,60 @@ static int do_env_ask(struct cmd_tbl *cm
+ }
+ #endif
+ 
++#if defined(CONFIG_CMD_ENV_READMEM)
++int do_env_readmem(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
++{
++      char varstr[CONFIG_SYS_CBSIZE];
++      const void *buf;
++      char *local_args[4];
++      ulong addr, bytes = 6;
++      int hexdump = 0;
++
++      /*
++       * Check the syntax:
++       *
++       * readmem [-b] name address [size]
++       */
++      if (argc < 3)
++              return CMD_RET_USAGE;
++
++      local_args[0] = argv[0];
++
++      if (!strncmp(argv[1], "-b", 3))
++              hexdump = 1;
++
++      local_args[1] = argv[hexdump + 1];
++      local_args[2] = varstr;
++      local_args[3] = NULL;
++
++      addr = simple_strtoul(argv[hexdump + 2], NULL, 16);
++
++      if (!hexdump)
++              bytes = simple_strtoul(argv[hexdump + 3], NULL, 16);
++
++      if (bytes < 1)
++              return 1;
++
++      if ((hexdump * 3) * bytes >= CONFIG_SYS_CBSIZE)
++              return 1;
++
++      buf = map_sysmem(addr, bytes);
++      if (!buf)
++              return 1;
++
++      if (hexdump) {
++              sprintf(varstr, "%pM", buf);
++      } else {
++              memcpy(varstr, buf, bytes);
++              varstr[bytes] = '\0';
++      }
++      unmap_sysmem(buf);
++
++      /* Continue calling setenv code */
++      return env_do_env_set(flag, 3, local_args, H_INTERACTIVE);
++}
++#endif
++
+ #if defined(CONFIG_CMD_ENV_CALLBACK)
+ static int print_static_binding(const char *var_name, const char *callback_name,
+                               void *priv)
+@@ -1095,6 +1149,9 @@ static struct cmd_tbl cmd_env_sub[] = {
+       U_BOOT_CMD_MKENT(load, 1, 0, do_env_load, "", ""),
+ #endif
+       U_BOOT_CMD_MKENT(print, CONFIG_SYS_MAXARGS, 1, do_env_print, "", ""),
++#if defined(CONFIG_CMD_ENV_READMEM)
++      U_BOOT_CMD_MKENT(readmem, CONFIG_SYS_MAXARGS, 3, do_env_readmem, "", ""),
++#endif
+ #if defined(CONFIG_CMD_RUN)
+       U_BOOT_CMD_MKENT(run, CONFIG_SYS_MAXARGS, 1, do_run, "", ""),
+ #endif
+@@ -1179,6 +1236,9 @@ U_BOOT_LONGHELP(env,
+ #if defined(CONFIG_CMD_NVEDIT_EFI)
+       "env print -e [-guid guid] [-n] [name ...] - print UEFI environment\n"
+ #endif
++#if defined(CONFIG_CMD_ENV_READMEM)
++      "env readmem [-b] name address size - read variable from memory\n"
++#endif
+ #if defined(CONFIG_CMD_RUN)
+       "env run var [...] - run commands in an environment variable\n"
+ #endif
+@@ -1287,6 +1347,17 @@ U_BOOT_CMD(
+ );
+ #endif
+ 
++#if defined(CONFIG_CMD_ENV_READMEM)
++U_BOOT_CMD_COMPLETE(
++      readmem,        CONFIG_SYS_MAXARGS,     3,      do_env_readmem,
++      "get environment variable from memory address",
++      "[-b] name address size\n"
++      "    - store memory address to env variable\n"
++      "      \"-b\": read binary ethaddr",
++      var_complete
++);
++#endif
++
+ #if defined(CONFIG_CMD_RUN)
+ U_BOOT_CMD_COMPLETE(
+       run,    CONFIG_SYS_MAXARGS,     1,      do_run,