EMERSON KJ3243X1-BB1接口卡
掃描從第一個(gè)可能的替代圖像的位置開(kāi)始向下執行，并首先搜索POST，然后搜索USER，最后搜索替代MOTLoad圖像。在多個(gè)相同類(lèi)型的圖像的情況下，控制被傳遞到掃描中遇到的第一個(gè)圖像。安全啟動(dòng)，無(wú)論是通過(guò)在通電復位后的前五秒內按下控制臺上的ESC或通過(guò)設置安全啟動(dòng)跳線(xiàn)來(lái)調用，都會(huì )中斷掃描過(guò)程。然后，用戶(hù)可以顯示可用的引導圖像并選擇期望的圖像。該功能用于在不再需要編程的備用啟動(dòng)映像時(shí)啟用恢復。以下輸出是交互式安全啟動(dòng)的示例：?jiǎn)?dòng)序列MOTLoad復位后的固件啟動(dòng)序列為：1。初始化緩存、MMU、FPU和其他CPU內部項。2.初始化內存控制器。3.搜索活動(dòng)閃存庫，可能以交互方式搜索有效的開(kāi)機自檢（POST）圖像。如果找到，則執行POST映像。完成后，POST映像返回并繼續啟動(dòng)。
The scan is performed downwards beginning at the location of the first possible alternate
image and searches first for POST, then USER, and finally Alternate MOTLoad images. In
the case of multiple images of the same type, control is passed to the first image
encountered in the scan.
Safe Start, whether invoked by hitting ESC on the console within the first five seconds
following power-on reset or by setting the Safe Start jumper, interrupts the scan process.
The user may then display the available boot images and select the desired image. The
feature is provided to enable recovery in cases when the programmed Alternate Boot
Image is no longer desired. The following output is an example of an interactive Safe Start:Startup Sequence
The firmware startup sequence following reset of MOTLoad is to:
1. Initialize cache, MMU, FPU, and other CPU internal items.
2. Initialize the memory controller.
3. Search the active flash bank, possibly interactively, for a valid Power On Self Test
(POST) image. If found, the POST images executes. Once completed, the POST
image returns and startup continues.
