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uboot: Add the missing disk write operation support

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uboot_disk_write() is currently lacking the write support
to storage devices because, historically, those devices did not
implement block_write() in U-Boot.

The solution has been tested using a patched U-Boot loading
and booting GRUB in a QEMU vexpress-a9 environment.
The disk write operations were triggered with GRUB's save_env
command.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Cristian Ciocaltea 2019-01-22 12:02:10 +02:00 • committed by Daniel Kiper
parent f8d1ad2678
commit 088f7f56e5
3 changed files with 34 additions and 7 deletions
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16
grub-core/kern/uboot/uboot.c
View file

@ -243,6 +243,22 @@ grub_uboot_dev_read (struct device_info *dev, void *buf, grub_size_t blocks,
return retval;
}
int
grub_uboot_dev_write (struct device_info *dev, const void *buf,
grub_size_t blocks, grub_uint32_t start)
{
int retval;
if (!OPEN_DEV (dev))
return -1;
if (!grub_uboot_syscall (API_DEV_WRITE, &retval, dev, buf,
&blocks, &start))
return -1;
return retval;
}
int
grub_uboot_dev_recv (struct device_info *dev, void *buf,
int size, int *real_size)