Hello Anqi Ren,
The latest version CodeWarrior doesn't support M29EW in the device list either.
Please try to use the one flash programming algorithm for AMD in C:\Freescale\CW_PA_v10.5.0\PA\bin\plugins\support\Flash_Programmer\EPPC according to your flash organization, probably you may choose amd16x2.elf.
Please refer to C:\Freescale\CW_PA_v10.5.0\PA\bin\plugins\support\Products\ProductData\FPDevices.mwpdb\FP\M29DW128G.xml and C:\Freescale\CW_PA_v10.5.0\PA\bin\plugins\support\Products\ProductData\FPDevices.mwpdb\product-manifest.xm to add device M29EW in CodeWarrior IDE by yourself.
Have a great day,
Yiping
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