1d232f354a
This fixes error erasing partial mtd partition which does not start on eraseblock boundary and allows using fconfig to configure redboot on devices such as the Gateworks Cambria. Signed-off-by: Maciej Skrzypek <maciej.skrzypek@flytronic.pl> SVN-Revision: 41733
146 lines
4.4 KiB
Diff
146 lines
4.4 KiB
Diff
--- a/drivers/mtd/mtdpart.c
|
|
+++ b/drivers/mtd/mtdpart.c
|
|
@@ -35,6 +35,8 @@
|
|
#include "mtdcore.h"
|
|
#include "mtdsplit.h"
|
|
|
|
+#define MTD_ERASE_PARTIAL 0x8000 /* partition only covers parts of an erase block */
|
|
+
|
|
/* Our partition linked list */
|
|
static LIST_HEAD(mtd_partitions);
|
|
static DEFINE_MUTEX(mtd_partitions_mutex);
|
|
@@ -231,13 +233,61 @@ static int part_erase(struct mtd_info *m
|
|
struct mtd_part *part = PART(mtd);
|
|
int ret;
|
|
|
|
+
|
|
+ instr->partial_start = false;
|
|
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
|
|
+ size_t readlen = 0;
|
|
+ u64 mtd_ofs;
|
|
+
|
|
+ instr->erase_buf = kmalloc(part->master->erasesize, GFP_ATOMIC);
|
|
+ if (!instr->erase_buf)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ mtd_ofs = part->offset + instr->addr;
|
|
+ instr->erase_buf_ofs = do_div(mtd_ofs, part->master->erasesize);
|
|
+
|
|
+ if (instr->erase_buf_ofs > 0) {
|
|
+ instr->addr -= instr->erase_buf_ofs;
|
|
+ ret = mtd_read(part->master,
|
|
+ instr->addr + part->offset,
|
|
+ part->master->erasesize,
|
|
+ &readlen, instr->erase_buf);
|
|
+
|
|
+ instr->len += instr->erase_buf_ofs;
|
|
+ instr->partial_start = true;
|
|
+ } else {
|
|
+ mtd_ofs = part->offset + part->mtd.size;
|
|
+ instr->erase_buf_ofs = part->master->erasesize -
|
|
+ do_div(mtd_ofs, part->master->erasesize);
|
|
+
|
|
+ if (instr->erase_buf_ofs > 0) {
|
|
+ instr->len += instr->erase_buf_ofs;
|
|
+ ret = mtd_read(part->master,
|
|
+ part->offset + instr->addr +
|
|
+ instr->len - part->master->erasesize,
|
|
+ part->master->erasesize, &readlen,
|
|
+ instr->erase_buf);
|
|
+ } else {
|
|
+ ret = 0;
|
|
+ }
|
|
+ }
|
|
+ if (ret < 0) {
|
|
+ kfree(instr->erase_buf);
|
|
+ return ret;
|
|
+ }
|
|
+
|
|
+ }
|
|
+
|
|
instr->addr += part->offset;
|
|
ret = part->master->_erase(part->master, instr);
|
|
if (ret) {
|
|
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
|
|
instr->fail_addr -= part->offset;
|
|
instr->addr -= part->offset;
|
|
+ if (mtd->flags & MTD_ERASE_PARTIAL)
|
|
+ kfree(instr->erase_buf);
|
|
}
|
|
+
|
|
return ret;
|
|
}
|
|
|
|
@@ -245,7 +295,25 @@ void mtd_erase_callback(struct erase_inf
|
|
{
|
|
if (instr->mtd->_erase == part_erase) {
|
|
struct mtd_part *part = PART(instr->mtd);
|
|
+ size_t wrlen = 0;
|
|
|
|
+ if (instr->mtd->flags & MTD_ERASE_PARTIAL) {
|
|
+ if (instr->partial_start) {
|
|
+ part->master->_write(part->master,
|
|
+ instr->addr, instr->erase_buf_ofs,
|
|
+ &wrlen, instr->erase_buf);
|
|
+ instr->addr += instr->erase_buf_ofs;
|
|
+ } else {
|
|
+ instr->len -= instr->erase_buf_ofs;
|
|
+ part->master->_write(part->master,
|
|
+ instr->addr + instr->len,
|
|
+ instr->erase_buf_ofs, &wrlen,
|
|
+ instr->erase_buf +
|
|
+ part->master->erasesize -
|
|
+ instr->erase_buf_ofs);
|
|
+ }
|
|
+ kfree(instr->erase_buf);
|
|
+ }
|
|
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
|
|
instr->fail_addr -= part->offset;
|
|
instr->addr -= part->offset;
|
|
@@ -503,18 +571,24 @@ static struct mtd_part *allocate_partiti
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
|
|
/* Doesn't start on a boundary of major erase size */
|
|
- /* FIXME: Let it be writable if it is on a boundary of
|
|
- * _minor_ erase size though */
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
|
- part->name);
|
|
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
|
|
+ if (((u32) slave->mtd.size) > master->erasesize)
|
|
+ slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
+ else
|
|
+ slave->mtd.erasesize = slave->mtd.size;
|
|
}
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
|
- mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
|
|
- slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
|
- part->name);
|
|
+ mtd_mod_by_eb(slave->offset + slave->mtd.size, &slave->mtd)) {
|
|
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
|
|
+
|
|
+ if ((u32) slave->mtd.size > master->erasesize)
|
|
+ slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
+ else
|
|
+ slave->mtd.erasesize = slave->mtd.size;
|
|
}
|
|
+ if ((slave->mtd.flags & (MTD_ERASE_PARTIAL|MTD_WRITEABLE)) == MTD_ERASE_PARTIAL)
|
|
+ printk(KERN_WARNING"mtd: partition \"%s\" must either start or end on erase block boundary or be smaller than an erase block -- forcing read-only\n",
|
|
+ part->name);
|
|
|
|
slave->mtd.ecclayout = master->ecclayout;
|
|
slave->mtd.ecc_step_size = master->ecc_step_size;
|
|
--- a/include/linux/mtd/mtd.h
|
|
+++ b/include/linux/mtd/mtd.h
|
|
@@ -55,6 +55,10 @@ struct erase_info {
|
|
u_long priv;
|
|
u_char state;
|
|
struct erase_info *next;
|
|
+
|
|
+ u8 *erase_buf;
|
|
+ u32 erase_buf_ofs;
|
|
+ bool partial_start;
|
|
};
|
|
|
|
struct mtd_erase_region_info {
|