Partitioning for a UEFI boot loader, can LVM be used?

Question

I have a Class called Product that contains some propeties, I wanna make that my class will be the base for an list of Product called Products. And this list can access in a UITableView to fill it with the content of Products.

Also, the content of each product will be filled by a web service.

My code is:

@interface Product : NSObject
{
    int identifier;
    NSString* title;
    NSString* quantity;
    float price;
    UIImage* image;
}

@property (nonatomic, assign) int identifier;
@property (nonatomic, retain) NSString* title;
@property (nonatomic, retain) NSString* quantity;
@property (nonatomic, assign) float price;
@property (nonatomic, retain) UIImage *image;


-(id)initWithProduct:(int) identifier withTitle:(NSString*)title numberUses:(NSString*)uses withPrice:(float)price withImage:(UIImage*)image;


@end

With his .m

@implementation Product
@synthesize identifier = _identifier;
@synthesize title = _title;
@synthesize price = _price;
@synthesize quantity = _quantity;
@synthesize image = _image;

- (void)dealloc {
    NSLog(@"article dealloc \n");
    [self.title release];
    [self.quantity release];
    [self.image release];

    [super dealloc];
}
- (id)init {

    self = [super init];
    if(self) {
        self.title     = [[[NSMutableString alloc] init] autorelease];
        self.identifier  = 0;
        self.price   = 45.0;
        self.quantity   = [[[NSMutableString alloc] init] autorelease];
        self.image    = [[[UIImage alloc] init] autorelease];

    }
    return self;
}

-(id)initWithProduct:(int) inIdentifier withTitle:(NSString*)inTitle numberUses:(NSString*)inQuantity withPrice:(float)inPrice withImage:(UIImage*)inImage
{
    self = [super init];
    if (self) {
        if (title!= nil) {
            self.title = inTitle;
        }
        if (quantity!= nil) {
            self.quantity = inTitle;
        }
        if (image!= nil) {
            self.title = inTitle;
        }
        self.price = inPrice;
        self.identifier = inIdentifier;
    }
    return self;
}    
@end

My UITableView header is:

@interface TableView : UIViewController
<   UITableViewDataSource
,   UITableViewDelegate
>{
    NSMutableArray *products;
}

in the m. I have:

EDIT Now the Title of my cell is shows as (null)

- (void)viewDidLoad
    {
        [super viewDidLoad];

        products = [[NSMutableArray alloc] init];
    [products addObject:[[Product alloc] initWithProduct:1 withTitle:@"df" numberUses:@"dsf" withPrice:12.3 withImage:[UIImage imageNamed:@"btn_invite"]]];
    [products addObject:[[Product alloc] initWithProduct:1 withTitle:@"2" numberUses:@"dsf" withPrice:12.3 withImage:[UIImage imageNamed:@"btn_invite"]]];
    [products addObject:[[Product alloc] initWithProduct:1 withTitle:@"4" numberUses:@"dsf" withPrice:12.3 withImage:[UIImage imageNamed:@"btn_invite"]]];
    [products addObject:[[Product alloc] initWithProduct:1 withTitle:@"4" numberUses:@"dsf" withPrice:12.3 withImage:[UIImage imageNamed:@"btn_invite"]]];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
Controller *cell = (Controller*)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
            if (cell == nil)
            {
                NSString* nameNib = UIUserInterfaceIdiomPad == UI_USER_INTERFACE_IDIOM() ? @"Controller" : @"ControllerIph";
                NSArray *nib = [[NSBundle mainBundle] loadNibNamed:nameNib owner:self options:nil];
                cell = [nib objectAtIndex:0];
            }
  Product* obj = [products objectAtIndex:indexPath.row];
            cell.title.text = [NSString stringWithFormat:@"%@", obj.title];
   return cell;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

                return 4;
    }

Thanks in advance!

Solution

No.

UEFI Bios tries to find a partition in a GPT-partitioned boot device. This partition needs to be tagged with "EFI System" (see fdisk's "t" command for all options) and also needs to be formatted with FAT filesystem.

You'll find a good explanation here...

Command (m for help): p
Disk /dev/sda: 167.7 GiB, 180045766656 bytes, 351651888 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt

Device      Start       End   Sectors   Size Type
/dev/sda1    2048    534527    532480   260M EFI System
/dev/sda2  534528 351651839 351117312 167.4G Linux LVM

Comments

[Chris Tetreault]

I don't see an initWithChip method in your Product implementation file

[lightless07]

When the table is load. [__NSArrayM objectAtIndex:]: index 4 beyond bounds [0 .. 3]'

[herzbube]

Can you show the implementation of tableView:numberOfRowsInSection:?

[lightless07]

Thanks for the feedback, I edit my question right now :)

[herzbube]

I just deleted my comments and made them into an answer so that I have more space to elaborate. Sorry for the confusion :-)

[herzbube]

Edited my answer why you see "(null)".

[Admin]

no. not possible. also, lvm is a pretty nasty tech anyway.

[Admin]

why would you be opposed to shar[ing] the 20GB device by splitting it... anyway? I don't understand that at all. It sounds like you're not very clear on what partitioning means, and maybe a little in the dark about UEFI as well. Look here and follow the links to rodsbooks.com

[Admin]

@mikeserv Well I wanted the 20GB device as a single partition for root. That leaves the larger device unadulterated for /home and media making upgrades or OS changes easier. What I ultimately did last night was set the 400MB device to be the /boot partition anyway. I did find in Arch Wiki documentation where they explicitly stated LVM cannot be used for the /boot partition.

[Admin]

@mikeserv I am very much in the dark about UEFI, I have only installed Linux before on a BIOS firmware and MBR partitions. UEFI and GUID partitions are very new to me.

[Admin]

I just meant - what have you got against partitioning the 20gb disk? And what I said about lvm - ok, it isn't in-and-of-itself nasty, but when it swallows whole disk arrays and becomes a single point of failure, well.... Yeah, that's why I pointed you to those links - did you follow them?

[Admin]

@maple_shaft try ZFS with freebsd. Even with a single disk, it’s just better.

[Admin]

@mikeserv but in this case there’s only one disk anyways (a laptop), which is also a single point of failure. Isn’t volume management easier than making size guesses for conventional partitions?

[lightless07]

Can you help me with the titles? My code don't show me correctly the content of the array :(

[Chris Tetreault]

look at @herzbube 's answer

[lightless07]

Thanks! :) Is pretty cool your help! Now, is correct my way of create the array of Products? It can help me if I wanna fill my array of objects with data of the web?

[herzbube]

@lightless07 The Product class certainly won't give you any trouble, after all it's just a simple data class. As for filling the array, well, I would suggest that you create a separate class that interacts with your web service and creates Product instances. Your controller can then obtain the Product instances from that other class. I don't have experience with web services, though, so I can't give you any hints that are more specific than this.