colibri_imx6: fix video stdout in default environment

[oweals/u-boot.git] / doc / README.cfi

diff --git a/doc/README.cfi b/doc/README.cfi
index d087ff0d63e6615e17c240f707861dfd3a324821..ad52850818ff90b54c9fdbfa8ebc6399ef192e6a 100644 (file)
--- a/doc/README.cfi
+++ b/doc/README.cfi
@@ -1,7 +1,7 @@
 The common CFI driver provides this weak default implementation for
 flash_cmd_reset():
 
-void __flash_cmd_reset(flash_info_t *info)
+static void __flash_cmd_reset(flash_info_t *info)
 {
        /*
         * We do not yet know what kind of commandset to use, so we issue
@@ -9,21 +9,55 @@ void __flash_cmd_reset(flash_info_t *info)
         * that AMD flash roms ignore the Intel command.
         */
        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
+       udelay(1);
        flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
 }
 void flash_cmd_reset(flash_info_t *info)
        __attribute__((weak,alias("__flash_cmd_reset")));
 
+Some flash chips seem to have trouble with this reset sequence.
+In this case, board-specific code can override this weak default
+version with a board-specific function.
 
-Some flash chips seems to have trouble with this reset sequence. In this case
-the board specific code can override this weak default version with a board
-specific function. For example the digsy_mtc board equipped with the M29W128GH
-from Numonyx needs this version to function properly:
+At the time of writing, there are two boards that define their own
+routine for this.
+
+First, the digsy_mtc board equipped with the M29W128GH from Numonyx
+needs this version to function properly:
 
 void flash_cmd_reset(flash_info_t *info)
 {
        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
 }
 
+In addition, the t3corp board defines the routine thusly:
+
+void flash_cmd_reset(flash_info_t *info)
+{
+       /*
+        * FLASH at address CONFIG_SYS_FLASH_BASE is a Spansion chip and
+        * needs the Spansion type reset commands. The other flash chip
+        * is located behind a FPGA (Xilinx DS617) and needs the Intel type
+        * reset command.
+        */
+       if (info->start[0] == CONFIG_SYS_FLASH_BASE)
+               flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
+       else
+               flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
+}
+
 see also:
 http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html
+
+
+Config Option
+
+  CONFIG_SYS_MAX_FLASH_SECT: Number of sectors available on Flash device
+
+  CONFIG_SYS_FLASH_CFI_WIDTH: Data-width of the flash device
+
+  CONFIG_CMD_FLASH: Enables Flash command library
+
+  CONFIG_FLASH_CFI_DRIVER: Enables CFI Flash driver
+
+  CONFIG_FLASH_CFI_MTD: Enables MTD frame work for NOR Flash devices