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Re: [edk] [edk2] Memory mapped file system on RAM used by EDK shell
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From: Daniel M. <dan...@er...> - 2011-07-11 14:08:23
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Thanks both for your help.
Here is what I am doing. In the toolkit there is an application called mkramdisk which installs the ramdisk driver and you can specify the number of bytes, for example:
fs0:\> mkramdisk.efi -s 2000 f
Device mapping table
f :BlockDevice - Alias (null)
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)
Done: RAM Disk [ f ] with size [ 2000MB ]
That creates a 2000MB ram disk called f. Nevertheless it appears to be some problem with the name cause I get:
fs0:\> map -r
Device mapping table
fs0 :BlockDevice - Alias f0agonennapphibbndlnmeaakamjeafdnb blk0
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)
fs1 :Removeable BlockDevice - Alias f40c0 blk1
Acpi(PNP0A03,0)/Pci(1D|7)/Usb(2, 0)
blk0 :BlockDevice - Alias f0agonennapphibbndlnmeaakamjeafdnb fs0
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)
blk1 :Removeable BlockDevice - Alias f40c0 fs1
Acpi(PNP0A03,0)/Pci(1D|7)/Usb(2, 0)
f0agonennapphibbndlnmeaakamjeafdnb :BlockDevice - Alias fs0 blk0
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)
f40c0 :Removeable BlockDevice - Alias fs1 blk1
Acpi(PNP0A03,0)/Pci(1D|7)/Usb(2, 0)
Where f0agonen... is a strange name.
There is a set of tools called EFI Disk utilities which I employed to format: http://www.intel.com/technology/efi/diskutil_overview.htm
First I tried using efifmt.efi directly on the created device, but it did not work:
fs1:\> EFIFMT.EFI blk0
EfiFmt Version 1.2. Based on EFI Version 2.10
IFSUTIL: Can't open drive. Status returned = C0000001.
Cannot determine file system of drive blk0.
Unable to determine file system type.
Cannot open volume for direct access.
What I do is first create a partition in the disk and then format it this way:
fs1:\> DISKPART.EFI
DiskPart Version 1.2. Based on EFI Version 2.10
DiskPart> list
### BlkSize BlkCount
--- ------- ----------------
0 200 100000
DiskPart> select 0
Selected Disk = 0
DiskPart> clean all
About to CLEAN (DESTROY) disk 0, are you SURE [y/n]?
CLEAN>> y
If you are REALLY SURE, type '$C'
CLEAN>> $C
DiskPart> new gpt
DiskPart> create name=partition type=efisys size=2000
DiskPart> exit
Exiting....
fs1:\> map -r
Device mapping table
fs0 :Removeable BlockDevice - Alias f40c0 blk0
Acpi(PNP0A03,0)/Pci(1D|7)/Usb(2, 0)
blk0 :Removeable BlockDevice - Alias f40c0 fs0
Acpi(PNP0A03,0)/Pci(1D|7)/Usb(2, 0)
blk1 :HardDisk - Alias (null)
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)/HD(Part1,Sig301D7800-1DD2-1000-9620-001A4B6FDBCA)
blk2 :BlockDevice - Alias (null)
VenMsg(06ED4DD0-FF78-11D3-BDC4-00A0C94053D1)
f40c0 :Removeable BlockDevice - Alias fs0 blk0
Shell> EFIFMT.EFI blk1 /FS:FAT32
EfiFmt Version 1.2. Based on EFI Version 2.10
WARNING, ALL DATA ON EFI DEVICE
blk1 WILL BE LOST!
Proceed with Format (Y/N)? y
Formatting 511M
Initializing the File Allocation Table (FAT)...
Volume label (11 characters, ENTER for none)? ramdisk
Format complete.
535769088 bytes total disk space.
535764992 bytes available on disk.
4096 bytes in each allocation unit.
130802 allocation units available on disk.
32 bits in each FAT entry.
Volume Serial Number is 000040B3-00004A89
Then everything goes fine I can read, write, mkdir etc.. on that volume and when using dblk the output seems correct:
Shell> dblk blk0
LBA 0000000000000000 Size 00000200 bytes BlkIo 01F14F18
00000000: EB 58 90 4D 53 44 4F 53-35 2E 30 00 02 08 26 00 *.X.MSDOS5.0...&.*
00000010: 02 00 00 00 00 F8 00 00-01 00 01 00 00 00 00 00 *................*
00000020: 00 00 79 00 31 1E 00 00-00 00 00 00 02 00 00 00 *..y.1...........*
00000030: 01 00 06 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000040: 00 00 29 27 7A 7B C4 4E-4F 20 4E 41 4D 45 20 20 *..)'z..NO NAME *
00000050: 20 20 46 41 54 33 32 20-20 20 33 C9 8E D1 BC F4 * FAT32 3.....*
00000060: 7B 8E C1 8E D9 BD 00 7C-88 4E 02 8A 56 40 B4 08 *.........N..V@..*
00000070: CD 13 73 05 B9 FF FF 8A-F1 66 0F B6 C6 40 66 0F *..s......f...@f<mailto:*..s......f...@f>.*
00000080: B6 D1 80 E2 3F F7 E2 86-CD C0 ED 06 41 66 0F B7 *....?.......Af..*
00000090: C9 66 F7 E1 66 89 46 F8-83 7E 16 00 75 38 83 7E *.f..f.F.....u8..*
000000A0: 2A 00 77 32 66 8B 46 1C-66 83 C0 0C BB 00 80 B9 **.w2f.F.f.......*
000000B0: 01 00 E8 2B 00 E9 48 03-A0 FA 7D B4 7D 8B F0 AC *...+..H.........*
000000C0: 84 C0 74 17 3C FF 74 09-B4 0E BB 07 00 CD 10 EB *..t.<.t.........*
000000D0: EE A0 FB 7D EB E5 A0 F9-7D EB E0 98 CD 16 CD 19 *................*
000000E0: 66 60 66 3B 46 F8 0F 82-4A 00 66 6A 00 66 50 06 *f`f;F...J.fj.fP.*
000000F0: 53 66 68 10 00 01 00 80-7E 02 00 0F 85 20 00 B4 *Sfh.......... ..*
00000100: 41 BB AA 55 8A 56 40 CD-13 0F 82 1C 00 81 FB 55 *A..U.V@........U<mailto:*A..U.V@........U>*
00000110: AA 0F 85 14 00 F6 C1 01-0F 84 0D 00 FE 46 02 B4 *.............F..*
00000120: 42 8A 56 40 8B F4 CD 13-B0 F9 66 58 66 58 66 58 *B.V@......fXfXfX<mailto:*B.V@......fXfXfX>*
00000130: 66 58 EB 2A 66 33 D2 66-0F B7 4E 18 66 F7 F1 FE *fX.*f3.f..N.f...*
00000140: C2 8A CA 66 8B D0 66 C1-EA 10 F7 76 1A 86 D6 8A *...f..f....v....*
00000150: 56 40 8A E8 C0 E4 06 0A-CC B8 01 02 CD 13 66 61 *V@............fa<mailto:*V@............fa>*
00000160: 0F 82 54 FF 81 C3 00 02-66 40 49 0F 85 71 FF C3 *..T.....f@I..q<mailto:*..T.....f@I..q>..*
00000170: 4E 54 4C 44 52 20 20 20-20 20 20 00 00 00 00 00 *NTLDR .....*
00000180: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
00000190: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 *................*
000001A0: 00 00 00 00 00 00 00 00-00 00 00 00 0D 0A 4E 54 *..............NT*
000001B0: 4C 44 52 20 69 73 20 6D-69 73 73 69 6E 67 FF 0D *LDR is missing..*
000001C0: 0A 44 69 73 6B 20 65 72-72 6F 72 FF 0D 0A 50 72 *.Disk error...Pr*
000001D0: 65 73 73 20 61 6E 79 20-6B 65 79 20 74 6F 20 72 *ess any key to r*
000001E0: 65 73 74 61 72 74 0D 0A-00 00 00 00 00 00 00 00 *estart..........*
000001F0: 00 00 00 00 00 00 00 00-00 AC BF CC 00 00 55 AA *..............U.*
But there is something that I do not understand. Why if I am reserving 2000MB when I format it it only recognizes 511MB?
Formatting 511M
I tried several times but I only got it to recognize the 511MB.
Thank you very much for your help again :)
BR
Daniel
________________________________
From: Andrew Fish [mailto:af...@ap...]
Sent: den 8 juli 2011 19:08
To: edk...@li...
Cc: efi...@li...
Subject: Re: [edk2] Memory mapped file system on RAM used by EDK shell
Daniel,
I think there is a RAM Disk driver in the toolkit.... It produces the Block IO protocol. The only problem is you have to format the Block IO partition to put a file system on it. There is an EFI application to do that. If the Block IO protocol abstracts blocks that contain a FAT file system then when you connect that handle the file system driver will bind and you will get a Simple File System Protocol that would show up at the shell prompt.
It would be possible to write a Simple File System Driver that just treated files as linked lists. I've never seen this done, but it is quite possible.
These two chunks work together to make Simple File System on top of ANSI C APIs:
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/EmulatorPkg/EmuSimpleFileSystemDxe/EmuSimpleFileSystem.c
https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2/EmulatorPkg/Unix/Host/PosixFileSystem.c
Maybe this would be a good GSOC project at some point.
Andrew Fish
On Jul 8, 2011, at 9:28 AM, Daniel Moral wrote:
Hi!
I want to build a memory mapped file system in order to use it with EDK1 Shell. What I want is to create a temporal file system using the RAM memory
of my board in order to store there files downloaded from a tftp server without needing an external flash memory. Therefore I could use the files
I download in other applications.
I am a bit lost on how I could do this. Would it be possible to create a virtual drive using the RAM memory and "trick" the shell so it thinks it is
just another volume? Or should I think in other possibilities?
Thank you very much.
BR
Daniel
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