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Fwd: crashing while trying to write to fis area from linux kernel
- From: alfred hitch <alfred dot hitch at gmail dot com>
- To: ecos-discuss at ecos dot sourceware dot org
- Date: Fri, 25 Feb 2005 04:55:44 -0500
- Subject: [ECOS] Fwd: crashing while trying to write to fis area from linux kernel
- References: <29f9165105022422433a927ef@mail.gmail.com>
- Reply-to: alfred hitch <alfred dot hitch at gmail dot com>
Hi,
I did some more digging through the driver code. I would mention my
set up and hardware :
Redboot : ver 1.92..
snapgear linux kernel 2.4.25-x
IXDP425 based board ..
Intel Strata Flash on board ..
Issue: write to fis area from ixp425.c before mtd partitions are mounted.
Function access similar to parse_redboot_partitions function ..
Observation:
Stepping through the driver code . file cfi_cmdset_0001.c
function do_write_buffer ..
fails at line 1294 :
/* check for lock bit */
if (status & CMD(0x02)) {
printk(KERN_ERR "status and cmd loop inside \n");
;
;;
}
Seems like driver is writting everything, but at the end finding lock
bit to be on .. ??
Any one faced this issue ?
can some one please share how one has been able to write to fis area
from kernel on this or similar enviornemt ..
any issues / workarounds to get this simple thing done ..
Cheers,
Alfred
---------- Forwarded message ----------
From: alfred hitch <alfred.hitch@gmail.com>
Date: Fri, 25 Feb 2005 01:43:21 -0500
Subject: crashing while trying to write to fis area from linux kernel
To: ecos-discuss@ecos.sourceware.org
Hi,
I am trying to update the fis area after the linux kernel boots up ..
but cannot write to it, kernel's crashing ..
I am able to read successfully fis contents using a pseudo driver I
have written,
but when I try to write to it its crashing.
My code is something like this:
1) First read a page size of data ..
struct fis_image_desc *buf;
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
/* Read the start of the last erase block */
ret = master->read(master, master->size - master->erasesize,
PAGE_SIZE, &retlen, (void *)buf);
2) Modify buf[i] as needed.
3) if(!(master->flags & MTD_WRITEABLE))
printk(" NOT writtable !! \n");
else
printk(" writtable \n");
/* Write the start of the last erase block */
ret = master->write(master, master->size - master->erasesize,
PAGE_SIZE, &retlen, (void *)buf);
Its crashing while I am trying to write in the above function.
I dont have much idea of the mtd driver and so I am defintely doing
something very simple and stupid ..
but could someone please point the same to me ..
Can someone give me a sample snnipet of code to do something like above ?
Cheers,
Alfred.
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