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imx233: move the freescale partition handling to its own file

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The freescale firmware partitions has a lots of quirks that
need to be dealt with, so do it the proper way.

Change-Id: I8a5bd3fb462a4df143bc6c931057f3ffedd4b3d3
This commit is contained in:
Amaury Pouly 2012-05-19 13:33:45 +02:00
parent 61b129ac1e
commit 07138ba2ba
5 changed files with 133 additions and 36 deletions
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44
firmware/target/arm/imx233/mmc-imx233.c
View file

@ -25,6 +25,7 @@
#include "storage.h"
#include "ssp-imx233.h"
#include "pinctrl-imx233.h"
#include "partitions-imx233.h"
/**
* This code assumes a single eMMC internal flash
@ -39,12 +40,13 @@
#define MMC_RCA 1
/** When set, this values restrict the windows of the read and writes */
static unsigned mmc_window_start = 0;
static unsigned mmc_window_end = INT_MAX;
static unsigned mmc_window_start;
static unsigned mmc_window_end;
static bool mmc_window_enable = true;
static long mmc_last_activity = -1;
static bool mmc_is_active = false;
static unsigned mmc_size = 0;
static int mmc_first_drive = 0;
static struct mutex mmc_mutex;
@ -142,37 +144,19 @@ int mmc_init(void)
mmc_size = *sec_count;
}
mmc_window_start = 0;
mmc_window_end = INT_MAX;
#ifdef SANSA_FUZEPLUS
if(mmc_window_enable)
if(imx233_partitions_is_window_enabled())
{
/**
* The Fuze+ uses a strange layout: is has a first MBR at sector 0 with four entries:
* 1) Actual user partition
* 2) Sigmatel boot partition
* 3)4) Other (certificate related ?) partitions
* The partition 1) has type 1 but it's actually a type 5 (logical partition) with
* a second partition table with usually one entry which is the FAT32 one.
* The first table uses 512-byte sector size and the second one usually uses
* 2048-byte logical sector size.
*
* We restrict mmc window to the user partition */
/* WARNING: mmc_first_drive is not set yet at this point */
uint8_t mbr[512];
mmc_window_start = 0;
mmc_window_end = INT_MAX;
ret = mmc_read_sectors(IF_MD2(0,) 0, 1, mbr);
if(ret != 0)
return -100;
if(mbr[510] != 0x55 || mbr[511] != 0xAA)
return -101; /* invalid MBR */
/* sanity check that the first partition is greater than 2Gib */
uint8_t *ent = &mbr[446];
mmc_window_start = ent[8] | ent[9] << 8 | ent[10] << 16 | ent[11] << 24;
mmc_window_end = (ent[12] | ent[13] << 8 | ent[14] << 16 | ent[15] << 24) +
mmc_window_start;
if(ent[4] == 0x53)
return -102; /* sigmatel partition */
if((mmc_window_end - mmc_window_start) < 4 * 1024 * 1024)
return -103; /* partition too small */
if(ret)
panicf("cannot read MBR: %d", ret);
ret = imx233_partitions_compute_window(mbr, &mmc_window_start, &mmc_window_end);
if(ret)
panicf("cannot compute partitions window: %d", ret);
mmc_size = mmc_window_end - mmc_window_start;
}
#endif
@ -182,7 +166,7 @@ int mmc_init(void)
int mmc_num_drives(int first_drive)
{
(void) first_drive;
mmc_first_drive = first_drive;
return 1;
}