avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/fs/zfs/dev.c

@@ -0,0 +1,111 @@
+/*
+ *
+ *	based on code of fs/reiserfs/dev.c by
+ *
+ *	(C) Copyright 2003 - 2004
+ *	Sysgo AG, <www.elinos.com>, Pavel Bartusek <pba@sysgo.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+
+#include <common.h>
+#include <config.h>
+#include <zfs_common.h>
+
+static struct blk_desc *zfs_blk_desc;
+static disk_partition_t *part_info;
+
+void zfs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info)
+{
+	zfs_blk_desc = rbdd;
+	part_info = info;
+}
+
+/* err */
+int zfs_devread(int sector, int byte_offset, int byte_len, char *buf)
+{
+	short sec_buffer[SECTOR_SIZE/sizeof(short)];
+	char *sec_buf = (char *)sec_buffer;
+	unsigned block_len;
+
+	/*
+	 *	Check partition boundaries
+	 */
+	if ((sector < 0) ||
+		((sector + ((byte_offset + byte_len - 1) >> SECTOR_BITS)) >=
+		 part_info->size)) {
+		/*		errnum = ERR_OUTSIDE_PART; */
+		printf(" ** zfs_devread() read outside partition sector %d\n", sector);
+		return 1;
+	}
+
+	/*
+	 *	Get the read to the beginning of a partition.
+	 */
+	sector += byte_offset >> SECTOR_BITS;
+	byte_offset &= SECTOR_SIZE - 1;
+
+	debug(" <%d, %d, %d>\n", sector, byte_offset, byte_len);
+
+	if (zfs_blk_desc == NULL) {
+		printf("** Invalid Block Device Descriptor (NULL)\n");
+		return 1;
+	}
+
+	if (byte_offset != 0) {
+		/* read first part which isn't aligned with start of sector */
+		if (zfs_blk_desc->block_read(zfs_blk_desc,
+					     part_info->start + sector, 1,
+					     (void *)sec_buf) != 1) {
+			printf(" ** zfs_devread() read error **\n");
+			return 1;
+		}
+		memcpy(buf, sec_buf + byte_offset,
+			   min(SECTOR_SIZE - byte_offset, byte_len));
+		buf += min(SECTOR_SIZE - byte_offset, byte_len);
+		byte_len -= min(SECTOR_SIZE - byte_offset, byte_len);
+		sector++;
+	}
+
+	if (byte_len == 0)
+		return 0;
+
+	/*	read sector aligned part */
+	block_len = byte_len & ~(SECTOR_SIZE - 1);
+
+	if (block_len == 0) {
+		u8 p[SECTOR_SIZE];
+
+		block_len = SECTOR_SIZE;
+		zfs_blk_desc->block_read(zfs_blk_desc,
+					 part_info->start + sector,
+					 1, (void *)p);
+		memcpy(buf, p, byte_len);
+		return 0;
+	}
+
+	if (zfs_blk_desc->block_read(zfs_blk_desc, part_info->start + sector,
+				     block_len / SECTOR_SIZE,
+				     (void *)buf) != block_len / SECTOR_SIZE) {
+		printf(" ** zfs_devread() read error - block\n");
+		return 1;
+	}
+
+	block_len = byte_len & ~(SECTOR_SIZE - 1);
+	buf += block_len;
+	byte_len -= block_len;
+	sector += block_len / SECTOR_SIZE;
+
+	if (byte_len != 0) {
+		/* read rest of data which are not in whole sector */
+		if (zfs_blk_desc->block_read(zfs_blk_desc,
+					     part_info->start + sector,
+					     1, (void *)sec_buf) != 1) {
+			printf(" ** zfs_devread() read error - last part\n");
+			return 1;
+		}
+		memcpy(buf, sec_buf, byte_len);
+	}
+	return 0;
+}