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partition size control | Cypress Semiconductor

partition size control

Summary: 1 Reply, Latest post by Madhu Sudhan on 04 Feb 2016 07:05 AM PST
Verified Answers: 0
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ajish_1475651's picture
13 posts

we  are designed usb sd3 based custom board. we have ported example illustrates the use of the FX3S firmware APIs to implement mass storage class device that allows access to SD/MMC devices connected to SD3 given along with SDK.

The application partitions the storage device found on storage port into two volumes, and then enumerates them as separate logical units on the USB side
in that example partitions  define by


.If i have increased to 4 ,it shows 4 partitions .  Out of 4 partitions only two partitions data copying possible. If i have clicking other two partitions an message displays " please insert the disk".

kindly suggest how to make multiple partitions and also please tell how  to control partions size of eacj partion

mady's picture
Cypress Employee
963 posts


Does the CyU3PSibPartitionStorage API in your firmware retirn success? Also, have you verified that when the number of partition is increases, you also have the sufficient storage for the new partitions?


- Madhu Sudhan

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