Format flash chip with FAT
phil.lindow at airbus.com
Tue Jun 5 11:03:48 UTC 2018
> Why do you want to use a FAT file system on a flash instead of JFFS2?
> With the functions you have, you have all what you need to use JFFS2.
Because the file system should be compatible with RTEMS, VxWorks and in the best case PikeOS.
I know that FAT is not the best choice for flash but I am afraid FAT is the only file system that is integrated in all three of them.
We are also discussing a custom file system but that would involve a bigger amount of work.
Features like wear-leveling are not very important because most of the time data will only be read and not written.
From: Sebastian Huber [mailto:sebastian.huber at embedded-brains.de]
Sent: Wednesday, May 30, 2018 7:23 AM
To: LINDOW, Phil; users at rtems.org
Subject: Re: Format flash chip with FAT
On 29/05/18 18:18, LINDOW, Phil wrote:
> I want to format a flash chip (S29GL01GP) with a FAT filesystem. I've
> tried the following approach:
> 1. I've implemented IO functions for my chip
> int flash_init(void* start_addr, flash_device_t* handle);
> int flash_erase_block(flash_device_t* handle, void* blk_addr);
> int flash_program(flash_device_t* handle, void* dst, void*
> data, unsigned long size);
> (These functions are tested and they work...)
> I must use these functions since the CPU and the flash chip
> are connected through an FPGA in order to expand the addressable memory.
> We have only 8 address lines available. But to make a long
> story short: I can’t use generic program and erase functions.
Why do you want to use a FAT file system on a flash instead of JFFS2?
With the functions you have, you have all what you need to use JFFS2.
Sebastian Huber, embedded brains GmbH
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