* max size of MTD? @ 2007-01-05 7:29 Seongsu Lee 2007-01-06 8:59 ` Seongsu Lee 0 siblings, 1 reply; 6+ messages in thread From: Seongsu Lee @ 2007-01-05 7:29 UTC (permalink / raw) To: linux-mtd Hi, What is the max size of a partition that can be used in MTD? I found that the u_int32_t is used for the variable size in mtd_info. Then, I think 4GB is currently the max size. Am I right? I want to use 6GB flash memory with a partition. How can I fix it for using more than 4GB? I changed u_int32_t into u_int64_t but it does not work. (kernel oops) -- Seongsu's blog - http://www.senux.com/ "Besides, I think [Slackware] sounds better than 'Microsoft,' don't you?" (By Patrick Volkerding) ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: max size of MTD? 2007-01-05 7:29 max size of MTD? Seongsu Lee @ 2007-01-06 8:59 ` Seongsu Lee 2007-01-08 11:49 ` Vinit Agnihotri 0 siblings, 1 reply; 6+ messages in thread From: Seongsu Lee @ 2007-01-06 8:59 UTC (permalink / raw) To: linux-mtd On Fri, Jan 05, 2007 at 04:29:41PM +0900, Seongsu Lee wrote: > Hi, > > What is the max size of a partition that can be used in MTD? > I found that the u_int32_t is used for the variable size > in mtd_info. Then, I think 4GB is currently the max size. > Am I right? > > I want to use 6GB flash memory with a partition. How can I > fix it for using more than 4GB? I changed u_int32_t into > u_int64_t but it does not work. (kernel oops) Hi, I changed the type of variable size in structure mtd_info from u_int32_t to u_int64_t. Some code such as printk is modified after the change. It works. I tested that mtdconcat can create 6GB MTD device as one device. -- Seongsu's blog - http://www.senux.com/ The aim of a joke is not to degrade the human being but to remind him that he is already degraded. -- George Orwell ^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: max size of MTD? 2007-01-06 8:59 ` Seongsu Lee @ 2007-01-08 11:49 ` Vinit Agnihotri 2007-01-08 13:03 ` Josh Boyer 2007-01-09 15:54 ` Seongsu Lee 0 siblings, 2 replies; 6+ messages in thread From: Vinit Agnihotri @ 2007-01-08 11:49 UTC (permalink / raw) To: linux-mtd; +Cc: 'Seongsu Lee' U have mentioned of creating 1 MTD device of 6GB by mtdconcat. However I am curious to know how many mtd devices u've concatenated to make 6GB possible??? I am using mtdramm as test device but I am not able to allocate memory over 1GB. So no question of having even more devices to make it above 5GB. Can you focus on the same question & help me. How can I allocate more memory than 4GB??? Or how can I create 6GB MTD device. My current test machine is AMD 64bit opteron with 1GB memory. Thanks in advance. Vinit. -----Original Message----- From: linux-mtd-bounces@lists.infradead.org [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of Seongsu Lee Sent: Saturday, January 06, 2007 2:30 PM To: linux-mtd@lists.infradead.org Subject: Re: max size of MTD? On Fri, Jan 05, 2007 at 04:29:41PM +0900, Seongsu Lee wrote: > Hi, > > What is the max size of a partition that can be used in MTD? > I found that the u_int32_t is used for the variable size > in mtd_info. Then, I think 4GB is currently the max size. > Am I right? > > I want to use 6GB flash memory with a partition. How can I > fix it for using more than 4GB? I changed u_int32_t into > u_int64_t but it does not work. (kernel oops) Hi, I changed the type of variable size in structure mtd_info from u_int32_t to u_int64_t. Some code such as printk is modified after the change. It works. I tested that mtdconcat can create 6GB MTD device as one device. -- Seongsu's blog - http://www.senux.com/ The aim of a joke is not to degrade the human being but to remind him that he is already degraded. -- George Orwell ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ ^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: max size of MTD? 2007-01-08 11:49 ` Vinit Agnihotri @ 2007-01-08 13:03 ` Josh Boyer 2007-01-09 15:54 ` Seongsu Lee 1 sibling, 0 replies; 6+ messages in thread From: Josh Boyer @ 2007-01-08 13:03 UTC (permalink / raw) To: Vinit Agnihotri; +Cc: linux-mtd, 'Seongsu Lee' On Mon, 2007-01-08 at 17:19 +0530, Vinit Agnihotri wrote: > U have mentioned of creating 1 MTD device of 6GB by mtdconcat. However I am > curious to know how many mtd devices u've concatenated to make 6GB > possible??? I am using mtdramm as test device but I am not able to allocate > memory over 1GB. So no question of having even more devices to make it above > 5GB. Can you focus on the same question & help me. How can I allocate more > memory than 4GB??? Or how can I create 6GB MTD device. > My current test machine is AMD 64bit opteron with 1GB memory. He has 6GiB of real flash memory, not DRAM. Allocating more than 1GiB of DRAM for mtdram will likely take more work. josh ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: max size of MTD? 2007-01-08 11:49 ` Vinit Agnihotri 2007-01-08 13:03 ` Josh Boyer @ 2007-01-09 15:54 ` Seongsu Lee 2007-01-10 8:27 ` Vinit Agnihotri 1 sibling, 1 reply; 6+ messages in thread From: Seongsu Lee @ 2007-01-09 15:54 UTC (permalink / raw) To: Vinit Agnihotri; +Cc: linux-mtd On Mon, Jan 08, 2007 at 05:19:25PM +0530, Vinit Agnihotri wrote: > U have mentioned of creating 1 MTD device of 6GB by mtdconcat. However I am > curious to know how many mtd devices u've concatenated to make 6GB > possible??? I am using mtdramm as test device but I am not able to allocate > memory over 1GB. So no question of having even more devices to make it above > 5GB. Can you focus on the same question & help me. How can I allocate more > memory than 4GB??? Or how can I create 6GB MTD device. > My current test machine is AMD 64bit opteron with 1GB memory. > > Thanks in advance. > Vinit. Hi Vinit, I have 6 physical flash memories in my test embedded board. The size of each flash memory is 1GB. The number of flash memory to be concatenated is 6. (1GB x 6 -> 6GB) I couldn't find out explicit limitation of number of devices to be concatenated by mtdconcat. After receving your mail, I comfirmed that mtdconcat works at least 8 sub mtd devices. I created 8 mtd device based on RAM. (I mean mtdram.) And I created a concatenated mtd device with 8 mtdram device. [root@hybus ~]# cat /proc/mtd dev: size erasesize name mtd0: 0000000000040000 00040000 "boot" mtd1: 0000000000180000 00040000 "kernel" mtd2: 0000000001e40000 00040000 "rootfs" mtd3: 0000000000400000 00020000 "mtdram_test_1" mtd4: 0000000000400000 00020000 "mtdram_test_2" mtd5: 0000000000400000 00020000 "mtdram_test_3" mtd6: 0000000000400000 00020000 "mtdram_test_4" mtd7: 0000000000400000 00020000 "mtdram_test_5" mtd8: 0000000000400000 00020000 "mtdram_test_6" mtd9: 0000000000400000 00020000 "mtdram_test_7" mtd10: 0000000000400000 00020000 "mtdram_test_8" mtd11: 0000000002000000 00020000 "test_part_0" [root@hybus ~]# mount -t jffs2 /dev/mtdblock11 /mnt/data11 [root@hybus ~]# df -h Filesystem Size Used Available Use% Mounted on /dev/rom2 30.3M 20.3M 9.9M 67% / 192.168.128.1:/nfs 28.9G 18.1G 9.3G 66% /mnt/nfs /dev/mtdblock11 32.0M 1.0M 31.0M 3% /mnt/data11 [root@hybus ~]# I think there is no limitation of number of sub mtd devices in code. But you may not create more than 15 mtd devices in a system. Max size of mtd device? I think it's 4GB. (u_int32_t size) I really hope that my post can help you. Follow is a patch to create more than one mtdram device. I worked linux kernel 2.6.11. --- linux-2.6.11-test/drivers/mtd/devices/mtdram.c.mtdram_test 2006-11-18 20:14:38.000000000 +0900 +++ linux-2.6.11-test/drivers/mtd/devices/mtdram.c 2007-01-10 00:33:27.000000000 +0900 @@ -108,19 +108,24 @@ return 0; } +#define NUMRAM (8) +static struct mtd_info *mtds[NUMRAM]; static void __exit cleanup_mtdram(void) { - if (mtd_info) { - del_mtd_device(mtd_info); + int i; + for (i = 0; i < NUMRAM; i++) { + if (mtds[i]) { + del_mtd_device(mtds[i]); #if CONFIG_MTDRAM_TOTAL_SIZE > 0 - if (mtd_info->priv) + if (mtds[i]->priv) #if CONFIG_MTDRAM_ABS_POS > 0 - iounmap(mtd_info->priv); + iounmap(mtds[i]->priv); #else - vfree(mtd_info->priv); + vfree(mtds[i]->priv); #endif #endif - kfree(mtd_info); + kfree(mtds[i]); + } } } @@ -186,9 +191,22 @@ #else /* CONFIG_MTDRAM_ABS_POS > 0 */ +static int test(int n); static int __init init_mtdram(void) { + int i; + printk(KERN_INFO "%d mtdram test devices will be created.\n", NUMRAM); + for (i = 0; i < NUMRAM; i++) { + test(i); + } + return 0; +} + +#define NAME_LEN (64) +static int test(int n) +{ void *addr; + char *name; int err; /* Allocate some memory */ mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); @@ -204,8 +222,10 @@ mtd_info = NULL; return -ENOMEM; } + name = (char *)kmalloc(NAME_LEN, GFP_KERNEL); + snprintf(name, NAME_LEN - 1, "mtdram_test_%d", n + 1); err = mtdram_init_device(mtd_info, addr, - MTDRAM_TOTAL_SIZE, "mtdram test device"); + MTDRAM_TOTAL_SIZE, name); if (err) { vfree(addr); @@ -214,6 +234,7 @@ return err; } memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); + mtds[n] = mtd_info; return err; } #endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */ > -----Original Message----- > From: linux-mtd-bounces@lists.infradead.org > [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of Seongsu Lee > Sent: Saturday, January 06, 2007 2:30 PM > To: linux-mtd@lists.infradead.org > Subject: Re: max size of MTD? > > On Fri, Jan 05, 2007 at 04:29:41PM +0900, Seongsu Lee wrote: > > Hi, > > > > What is the max size of a partition that can be used in MTD? > > I found that the u_int32_t is used for the variable size > > in mtd_info. Then, I think 4GB is currently the max size. > > Am I right? > > > > I want to use 6GB flash memory with a partition. How can I > > fix it for using more than 4GB? I changed u_int32_t into > > u_int64_t but it does not work. (kernel oops) > > Hi, > > I changed the type of variable size in structure mtd_info > from u_int32_t to u_int64_t. Some code such as printk is > modified after the change. It works. I tested that > mtdconcat can create 6GB MTD device as one device. -- Seongsu's blog - http://www.senux.com/ How do I type "for i in *.dvi do xdvi i done" in a GUI? (Discussion in comp.os.linux.misc on the intuitiveness of interfaces.) ^ permalink raw reply [flat|nested] 6+ messages in thread
* RE: max size of MTD? 2007-01-09 15:54 ` Seongsu Lee @ 2007-01-10 8:27 ` Vinit Agnihotri 0 siblings, 0 replies; 6+ messages in thread From: Vinit Agnihotri @ 2007-01-10 8:27 UTC (permalink / raw) To: linux-mtd Thanks for your helpful reply. I was trying to allocate more than 1GB through mtdram by using vmalloc, which is not possible as my physical ram is 1GB. But thanks for detailed reply & patch.The patch will sure help me to work with multiple mtdram & mtdconcat. Thanks & Regards Vinit. -----Original Message----- From: Seongsu Lee [mailto:senux@senux.com] Sent: Tuesday, January 09, 2007 9:25 PM To: Vinit Agnihotri Cc: linux-mtd@lists.infradead.org; jwboyer@linux.vnet.ibm.com Subject: Re: max size of MTD? On Mon, Jan 08, 2007 at 05:19:25PM +0530, Vinit Agnihotri wrote: > U have mentioned of creating 1 MTD device of 6GB by mtdconcat. However I am > curious to know how many mtd devices u've concatenated to make 6GB > possible??? I am using mtdramm as test device but I am not able to allocate > memory over 1GB. So no question of having even more devices to make it above > 5GB. Can you focus on the same question & help me. How can I allocate more > memory than 4GB??? Or how can I create 6GB MTD device. > My current test machine is AMD 64bit opteron with 1GB memory. > > Thanks in advance. > Vinit. Hi Vinit, I have 6 physical flash memories in my test embedded board. The size of each flash memory is 1GB. The number of flash memory to be concatenated is 6. (1GB x 6 -> 6GB) I couldn't find out explicit limitation of number of devices to be concatenated by mtdconcat. After receving your mail, I comfirmed that mtdconcat works at least 8 sub mtd devices. I created 8 mtd device based on RAM. (I mean mtdram.) And I created a concatenated mtd device with 8 mtdram device. [root@hybus ~]# cat /proc/mtd dev: size erasesize name mtd0: 0000000000040000 00040000 "boot" mtd1: 0000000000180000 00040000 "kernel" mtd2: 0000000001e40000 00040000 "rootfs" mtd3: 0000000000400000 00020000 "mtdram_test_1" mtd4: 0000000000400000 00020000 "mtdram_test_2" mtd5: 0000000000400000 00020000 "mtdram_test_3" mtd6: 0000000000400000 00020000 "mtdram_test_4" mtd7: 0000000000400000 00020000 "mtdram_test_5" mtd8: 0000000000400000 00020000 "mtdram_test_6" mtd9: 0000000000400000 00020000 "mtdram_test_7" mtd10: 0000000000400000 00020000 "mtdram_test_8" mtd11: 0000000002000000 00020000 "test_part_0" [root@hybus ~]# mount -t jffs2 /dev/mtdblock11 /mnt/data11 [root@hybus ~]# df -h Filesystem Size Used Available Use% Mounted on /dev/rom2 30.3M 20.3M 9.9M 67% / 192.168.128.1:/nfs 28.9G 18.1G 9.3G 66% /mnt/nfs /dev/mtdblock11 32.0M 1.0M 31.0M 3% /mnt/data11 [root@hybus ~]# I think there is no limitation of number of sub mtd devices in code. But you may not create more than 15 mtd devices in a system. Max size of mtd device? I think it's 4GB. (u_int32_t size) I really hope that my post can help you. Follow is a patch to create more than one mtdram device. I worked linux kernel 2.6.11. --- linux-2.6.11-test/drivers/mtd/devices/mtdram.c.mtdram_test 2006-11-18 20:14:38.000000000 +0900 +++ linux-2.6.11-test/drivers/mtd/devices/mtdram.c 2007-01-10 00:33:27.000000000 +0900 @@ -108,19 +108,24 @@ return 0; } +#define NUMRAM (8) +static struct mtd_info *mtds[NUMRAM]; static void __exit cleanup_mtdram(void) { - if (mtd_info) { - del_mtd_device(mtd_info); + int i; + for (i = 0; i < NUMRAM; i++) { + if (mtds[i]) { + del_mtd_device(mtds[i]); #if CONFIG_MTDRAM_TOTAL_SIZE > 0 - if (mtd_info->priv) + if (mtds[i]->priv) #if CONFIG_MTDRAM_ABS_POS > 0 - iounmap(mtd_info->priv); + iounmap(mtds[i]->priv); #else - vfree(mtd_info->priv); + vfree(mtds[i]->priv); #endif #endif - kfree(mtd_info); + kfree(mtds[i]); + } } } @@ -186,9 +191,22 @@ #else /* CONFIG_MTDRAM_ABS_POS > 0 */ +static int test(int n); static int __init init_mtdram(void) { + int i; + printk(KERN_INFO "%d mtdram test devices will be created.\n", NUMRAM); + for (i = 0; i < NUMRAM; i++) { + test(i); + } + return 0; +} + +#define NAME_LEN (64) +static int test(int n) +{ void *addr; + char *name; int err; /* Allocate some memory */ mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); @@ -204,8 +222,10 @@ mtd_info = NULL; return -ENOMEM; } + name = (char *)kmalloc(NAME_LEN, GFP_KERNEL); + snprintf(name, NAME_LEN - 1, "mtdram_test_%d", n + 1); err = mtdram_init_device(mtd_info, addr, - MTDRAM_TOTAL_SIZE, "mtdram test device"); + MTDRAM_TOTAL_SIZE, name); if (err) { vfree(addr); @@ -214,6 +234,7 @@ return err; } memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); + mtds[n] = mtd_info; return err; } #endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */ > -----Original Message----- > From: linux-mtd-bounces@lists.infradead.org > [mailto:linux-mtd-bounces@lists.infradead.org] On Behalf Of Seongsu Lee > Sent: Saturday, January 06, 2007 2:30 PM > To: linux-mtd@lists.infradead.org > Subject: Re: max size of MTD? > > On Fri, Jan 05, 2007 at 04:29:41PM +0900, Seongsu Lee wrote: > > Hi, > > > > What is the max size of a partition that can be used in MTD? > > I found that the u_int32_t is used for the variable size > > in mtd_info. Then, I think 4GB is currently the max size. > > Am I right? > > > > I want to use 6GB flash memory with a partition. How can I > > fix it for using more than 4GB? I changed u_int32_t into > > u_int64_t but it does not work. (kernel oops) > > Hi, > > I changed the type of variable size in structure mtd_info > from u_int32_t to u_int64_t. Some code such as printk is > modified after the change. It works. I tested that > mtdconcat can create 6GB MTD device as one device. -- Seongsu's blog - http://www.senux.com/ How do I type "for i in *.dvi do xdvi i done" in a GUI? (Discussion in comp.os.linux.misc on the intuitiveness of interfaces.) ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2007-01-10 8:27 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2007-01-05 7:29 max size of MTD? Seongsu Lee 2007-01-06 8:59 ` Seongsu Lee 2007-01-08 11:49 ` Vinit Agnihotri 2007-01-08 13:03 ` Josh Boyer 2007-01-09 15:54 ` Seongsu Lee 2007-01-10 8:27 ` Vinit Agnihotri
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