JZ2440開發板使用問題，U-Boot燒寫程序到Nand Flash時報錯：NAND write: incorrect device type in bootloader
'bootloader' is not a number

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這是因為分區名中u-boot，不是bootloader，而cmd_menu.c里用的是bootloader
可以執行：mtdpart default
? ?? ?? ?? ?save?

參考文章：https://bbs.elecfans.com/jishu_1805952_1_1.html

##### 100ask Bootloader for OpenJTAG ##### [n] Download u-boot to Nand Flash [o] Download u-boot to Nor Flash [k] Download Linux kernel uImage [j] Download root_jffs2 image [y] Download root_yaffs image [d] Download to SDRAM & Run [z] Download zImage into RAM [g] Boot linux from RAM [f] Format the Nand Flash [s] Set the boot parameters [b] Boot the system [r] Reboot u-boot [q] Quit from menu Enter your selection: q OpenJTAG> mtdpart default OpenJTAG> save Saving Environment to NAND... Erasing Nand...Writing to Nand... done OpenJTAG> menu##### 100ask Bootloader for OpenJTAG ##### [n] Download u-boot to Nand Flash [o] Download u-boot to Nor Flash [k] Download Linux kernel uImage [j] Download root_jffs2 image [y] Download root_yaffs image [d] Download to SDRAM & Run [z] Download zImage into RAM [g] Boot linux from RAM [f] Format the Nand Flash [s] Set the boot parameters [b] Boot the system [r] Reboot u-boot [q] Quit from menu Enter your selection: n USB host is connected. Waiting a download.Now, Downloading [ADDRESS:30000000h,TOTAL:18338] RECEIVED FILE SIZE: 18338 (17KB/S, 1S)NAND erase: device 0 offset 0x0, size 0x40000 Erasing at 0x20000 -- 100% complete. OKNAND write: device 0 offset 0x0, size 0x4798Writing data at 0x4000 -- 100% complete.18328 bytes written: OK

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