Multiple Flash Bank Enumeration
Joe Barnett
joseph.barnett at gmail.com
Wed Dec 1 11:25:25 EST 2004
I am having an issue with multiple flash bank enumeration. I have two
banks of flash, each consisting of 2 x16 Intel Strata flash chips. I
am creating two maps (in the same mapping file) and preforming a probe
in each case. The interesting thing is that in the first probe MTD
sees a 1x32 flash in 32-bit mode. In the second probe MTD sees a 2 x
16 flash in 32-bit mode. Furthermore during the first probe, the
actual size returned in the mtd_info->size is 0x1000000, where the
size of the secondis correct at 0x2000000. Can anyone clue me in as to
what might be the issue? Here is a code snippet of my map file:
_______________[BEGIN CODE SNIPPET]_______________
static struct map_info myflash_map[] = {
{
.name = FLASH_CS0_NAME,
.size = FLASH_EXT_FLASH_SIZE_ACTUAL,
.bankwidth = 4,
.phys = FLASH_EXT_FLASH_BASE_1
},
{
.name = FLASH_CS1_NAME,
.size = FLASH_EXT_FLASH_SIZE_ACTUAL,
.bankwidth = 4,
.phys = FLASH_EXT_FLASH_BASE_2
},
};
static struct mtd_info *flash[2];
static struct mtd_info *chunk;
static int __init init_myflash(void)
{
int dev_cnt = 0,
i = 0;
for (i = 0; i < NUM_FLASH_BANKS; i++) {
printk(KERN_NOTICE "Flash device : expected lentgh : 0x%lx at 0x%lx\n",
myflash_map[i].size,
myflash_map[i].phys);
myflash_map[i].virt = (unsigned long)ioremap_nocache(myflash_map[i].phys,
myflash_map[i].size);
if (!myflash_map[i].virt) {
printk("Failed to ioremap_nocache\n");
return -EIO;
}
simple_map_init(&myflash_map[i]);
if(NULL != (flash[i] = do_map_probe("cfi_probe", &myflash_map[i] )) {
flash[i]->owner = THIS_MODULE;
++dev_cnt;
printk("Probe chip returned size : 0x%lx\n",
flash[i]->size);
}
else {
iounmap((void *)myflash_map[i].virt);
}
}
if(dev_cnt >= 2) {
/* Combine the two flash banks into a single MTD device & register it: */
chunk = mtd_concat_create(flash, 2, "Flash Banks 0 and 1");
if(chunk) {
add_mtd_device(chunk);
}
}
return(dev_cnt ? 0 : -ENXIO);
}
_______________[END CODE SNIPPET]_______________
Here is some debugging info that I have been able to generate. My
primary confustion is how, each bank could be found as different types
as they are the same. This worked fine in 2.6.7, minus the bankwidth
modification recently introduced. In the qry_present function I pust
an extra printk that dumps the CFI structure, and if one is found,
then prints out the whole private content of the found device. Here is
the debugging that I gathered... for both banks:
________________[BEGIN DEBUG INFO]__________________________
devilBox:/# modprobe myflash
Flash device : expected length : 0x2000000 at 0xa0000000
genprobe_new_chip : MIN chips : 0x1 : MAX chips : 0x4 : Interleave
(nr_chips): 0x1
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x1
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x2
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x4
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
FOUND CHIP : Setting up
Number of erase regions: 1
Erase Region #0: BlockSize 0x20000 bytes, 128 blocks
FLASH MFR : 0x89 : ID : 0x2
User Flash Bank 0: Found 1 x32 devices at 0x0 in 32-bit bank
Primary Vendor Command Set: 0001 (Intel/Sharp Extended)
Primary Algorithm Table at 0031
Alternative Vendor Command Set: 0000 (None)
No Alternate Algorithm Table
Vcc Minimum: 2.7 V
Vcc Maximum: 3.6 V
No Vpp line
Typical byte/word write timeout: 256 µs
Maximum byte/word write timeout: 512 µs
Typical full buffer write timeout: 512 µs
Maximum full buffer write timeout: 1024 µs
Typical block erase timeout: 1024 ms
Maximum block erase timeout: 4096 ms
Chip erase not supported
Device size: 0x1000000 bytes (16 MiB)
Flash Device Interface description: 0x0001
- x16-only asynchronous interface
Max. bytes in buffer write: 0x40
Number of Erase Block Regions: 1
settings DevSize/Chipshift: 0x18 : Chip Max : 0x2
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x4
CFI Mode 0x1
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x1
Chip Shift 0x18
Skipping QRY not present
Probing : 0x1000000: Chip Max 0x2
Intel/Sharp Extended Query Table at 0x0031
cfi_cmdset_0001: Erase suspend on write enabled
number of CFI chips: 1
Using buffer write method
Probe chip returned size : 0x1000000
Flash device: expected length 0x2000000 at 0xa2000000
genprobe_new_chip : MIN chips : 0x1 : MAX chips : 0x4 : Interleave
(nr_chips): 0x1
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x1
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x2
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
QUERY PEEK:
Cmdset 0x0
Interleave 0x1
Dev Type 0x4
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
genprobe_new_chip : MIN chips : 0x1 : MAX chips : 0x4 : Interleave
(nr_chips): 0x2
QUERY PEEK:
Cmdset 0x0
Interleave 0x2
Dev Type 0x1
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
Skipping QRY not present
QUERY PEEK:
Cmdset 0x0
Interleave 0x2
Dev Type 0x2
CFI Mode 0x0
Unlock 1 0x0
Unlock 2 0x0
Num Chips 0x0
Chip Shift 0x0
FOUND CHIP : Setting up
Number of erase regions: 1
Erase Region #0: BlockSize 0x20000 bytes, 128 blocks
FLASH MFR : 0x89 : ID : 0x2
User Flash Bank 1: Found 2 x16 devices at 0x0 in 32-bit bank
Primary Vendor Command Set: 0001 (Intel/Sharp Extended)
Primary Algorithm Table at 0031
Alternative Vendor Command Set: 0000 (None)
No Alternate Algorithm Table
Vcc Minimum: 2.7 V
Vcc Maximum: 3.6 V
No Vpp line
Typical byte/word write timeout: 256 µs
Maximum byte/word write timeout: 512 µs
Typical full buffer write timeout: 512 µs
Maximum full buffer write timeout: 1024 µs
Typical block erase timeout: 1024 ms
Maximum block erase timeout: 4096 ms
Chip erase not supported
Device size: 0x1000000 bytes (16 MiB)
Flash Device Interface description: 0x0001
- x16-only asynchronous interface
Max. bytes in buffer write: 0x40
Number of Erase Block Regions: 1
settings DevSize/Chipshift: 0x19 : Chip Max : 0x1
Intel/Sharp Extended Query Table at 0x0031
cfi_cmdset_0001: Erase suspend on write enabled
number of CFI chips: 1
Using buffer write method
Probe chip returned size : 0x2000000
________________[END DEBUG INFO]__________________________
I am confused how each device can show up differently in each probe,
does anyone have any clues or pointers where I can go look? Thank you
in advance,
Kind regards,
Joseph Barnett
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